Noun

Introduction
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 word "noun" comes from the latin nomen meaning "name." Word classes like nouns were first described by Sanskrit grammarian Pв?ini and ancient Greeks like Dionysios Thrax, and defined in terms of their morphological properties. For example, in Ancient Greek, nouns can be inflected for grammatical case, such as dative or accusative. Verbs, on the other hand, can be inflected for tenses, such as past, present or future, while nouns cannot. Aristotle also had a notion of onomata (nouns) and rhemata (verbs) which, however, does not exactly correspond our notions...

We have investigated the noun, the main part of speech in English grammar. We chose the noun as the theme of our course work because we interested in it. We used different kind of references to investigate the noun. 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. Whether or not a noun is uncountable is determined by its meaning: an uncountable noun represents something which tends to be viewed as a whole or as a single entity, rather than as one of a number of items which can be counted as individual units. Singular verb forms are used with uncountable nouns. Uncountable nouns are substances, concepts etc that we cannot divide into separate elements. We cannot "count" them. For example, we cannot count "milk". We can count "bottles of milk" or "litres of milk", but we cannot count "milk" itself. We usually treat uncountable nouns as singular. We use a singular verb. Countable nouns are easy to recognize. They are things that we can count. For example: "pen". We can count pens. We can have one, two, three or more pens. We cannot say that it is finished investigation of this theme, because we are going to continue its investigation in our diploma work.