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In traditional school grammars, one often encounters the definition of nouns that they are all and only those expressions that refer to a person, place, thing, event, substance, quality, or idea, etc. This is a semantic definition. It has been criticized by contemporary linguists as being quite uninformative. Part of the problem is that the definition makes use of relatively general nouns ("thing," "phenomenon," "event") to define what nouns are. The existence of such general nouns shows us that nouns are organized in taxonomic hierarchies. But other kinds of expressions are also organized in hierarchies. For example all of the verbs "stroll," "saunter," "stride," and "tread" are more specific words than the more general "walk." The latter is more specific than the verb "move." But it is unlikely that such hierarchies can be used to define nouns and verbs. Furthermore, an influential theory has it that verbs like "kill" or "die" refer to events, and so they fall under the definition. Similarly, adjectives like "yellow" or "difficult" might be thought to refer to qualities, and adverbs like "outside" or "upstairs" seem to refer to places. Worse still, a trip into the woods can be referred to by the verbs "stroll" or "walk." But verbs, adjectives and adverbs are not nouns, and nouns aren't verbs. So the definition is not particularly helpful in distinguishing nouns from other parts of speech.
The common semantic definition of nouns in the US is: a noun refers to a person, place, or thing. Unfortunately, this definition doesn't work: running is a noun and it refers to an activity; goodness is a noun and it refers to a quality. Semantic definitions of nouns are all problematic but a reasonable rule of thumb is a noun treats things in the real world as (concrete or abstract) objects or substances.
A noun is the name of a person, place, thing, or idea. Whatever exists, we assume, can be named, and that name is a noun. A proper noun, which names a specific person, place, or thing (Carlos, Queen Marguerite, Middle East, Jerusalem, Malaysia, Presbyterianism, God, Spanish, Buddhism, the Republican Party), is almost always capitalized. A proper noun used as an addressed person's name is called a noun of address. Common nouns name everything else, things that usually are not capitalized.
A group of related words can act as a single noun-like entity within a sentence. A Noun Clause contains a subject and verb and can do anything that a noun can do:
What he does for this town is a blessing.
A Noun Phrase, frequently a noun accompanied by modifiers, is a group of related words acting as a noun: the oil depletion allowance; the abnormal, hideously enlarged nose.
There is a separate section on word combinations that become Compound Nouns -- such as daughter-in-law, half-moon, and stick-in-the-mud.
Another semantic definition of nouns is that they are prototypically referential. That definition is also not very helpful in distinguishing actual nouns from verbs. But it may still correctly identify a core property of nounhood. For example, we will tend to use nouns like "fool" and "car" when we wish to refer to fools and cars, respectively. The notion that this is prototypocal reflects the fact that such nouns can be used, even though nothing with the corresponding property is referred to:
John is no fool.
If I had a car, I'd go to Marakech.
The first sentence above doesn't refer to any fools, nor does the second one refer to any particular car.
The British logician Peter Thomas Geach proposed a very subtle semantic definition of nouns. He noticed that adjectives like "same" can modify nouns, but no other kinds of parts of speech, like verbs or adjectives. Not only that, but there also doesn't seem to exist any other expressions with similar meaning that can modify verbs and adjectives. Consider the following examples.
Good: John and Bill participated in the same fight.
Bad: *John and Bill samely fought.
There is no English adverb "samely." In some other languages, like Czech, however there are adverbs corresponding to "samely." Hence, in Czech, the translation of the last sentence would be fine; however, it would mean that John and Bill fought in the same way: not that they participated in the same fight. Geach proposed that we could explain this, if nouns denote logical predicate with identity criteria. An identity criterion would allow us to conclude, for example, that "person x at time 1 is the same person as person y at time 2." Different nouns can have different identity criteria. A well known example of this is due to Gupta:
National Airlines transported 2 million passengers in 1979.
National Airlines transported (at least) 2 million persons in 1979.
Given that, in general, all passengers are persons, the last sentence above ought to follow logically from the first one. But it doesn't. It is easy to imagine, for example, that on average, every person who travelled with National Airlines in 1979, travelled with them twice. In that case, one would say that the airline transported 2 million passengers but only 1 million persons. Thus, the way that we count passengers isn't necessarily the same as the way that we count persons. Put somewhat differently: At two different times, you may correspond to two distinct passengers, even though you are one and the same person. For a precise definition of identity criteria, see Gupta.
Recently, the linguist Mark Baker has proposed that Geach's definition of nouns in terms of identity criteria allows us to explain the characteristic properties of nouns. He argues that nouns can co-occur with (in-)definite articles and numerals, and are "prototypically referential" because they are all and only those parts of speech that provide identity criteria. Baker's proposals are quite new, and linguists are still evaluating them.
Nouns can be classified further as count nouns, which name anything that can be counted (four books, two continents, a few dishes, a dozen buildings); mass nouns (or non-count nouns), which name something that can't be counted (water, air, energy, blood); and collective nouns, which can take a singular form but are composed of more than one individual person or items (jury, team, class, committee, herd). We should note that some words can be either a count noun or a non-count noun depending on how they're being used in a sentence:
a. He got into trouble. (non-count)
b. He had many troubles. (countable)
c. Experience (non-count) is the best teacher.
d. We had many exciting experiences (countable) in college.
Whether these words are count or non-count will determine whether they can be used with articles and determiners or not. (We would not write "He got into the troubles," but we could write about "The troubles of Ireland."
Some texts will include the category of abstract nouns, by which we mean the kind of word that is not tangible, such as warmth, justice, grief, and peace. Abstract nouns are sometimes troublesome for non-native writers because they can appear with determiners or without: "Peace settled over the countryside." "The skirmish disrupted the peace that had settled over the countryside." See the section on Plurals for additional help with collective nouns, words that can be singular or plural, depending on context.
Nouns can be in the subjective, possessive, and objective case. The word case defines the role of the noun in the sentence. Is it a subject, an object, or does it show possession?
· The English professor [subject] is tall.
· He chose the English professor [object].
· The English professor's [possessive] car is green.
Nouns in the subject and object role are identical in form; nouns that show the possessive, however, take a different form. Usually an apostrophe is added followed by the letter s (except for plurals, which take the plural "-s" ending first, and then add the apostrophe). See the section on Possessives for help with possessive forms. There is also a table outlining the cases of nouns and pronouns.
Almost all nouns change form when they become plural, usually with the simple addition of an -s or -es. Unfortunately, it's not always that easy, and a separate section on Plurals offers advice on the formation of plural noun forms.
Back in the gold rush days, every little town in the American Old West had an assayer's office, a place where wild-eyed prospectors could take their bags of ore for official testing, to make sure the shiny stuff they'd found was the real thing, not "fool's gold." We offer here some assay tests for nouns. There are two kinds of tests: formal and functional -- what a word looks like (the endings it takes) and how a word behaves in a sentence.
· Formal Tests
1. Does the word contain a noun-making morpheme? organization, misconception, weirdness, statehood, government, democracy, philistinism, realtor, tenacity, violinist
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