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In grammar, a part of speech (also a word class, a lexical class, or a lexical category) is a linguistic category of words (or more precisely lexical items), which is generally defined by the syntactic or morphological behaviour of the lexical item in question. Common linguistic categories include noun and verb, among others. There are open word classes, which constantly acquire new members, and closed word classes, which acquire new members infrequently, if at all.
Almost all languages have the lexical categories noun and verb, but beyond these there are significant variations in different languages. For example, Japanese has as many as three classes of adjectives where English has one; Chinese, Korean and Japanese have nominal classifiers whereas European languages do not; many languages do not have a distinction between adjectives and adverbs, adjectives and verbs (see stative verbs) or adjectives and nouns, etc. This variation in the number of categories and their identifying properties entails that analysis be done for each individual language. Nevertheless the labels for each category are assigned on the basis of universal criteria.
Since the Greek grammar of 2nd century BC, parts of speech have been defined by morphological, syntactic and semantic criteria. However, there is currently no generally agreed-upon classification scheme that can apply to all languages, or even a set of criteria upon which such a scheme should be based.
English words have been traditionally classified into eight lexical categories, or parts of speech (and are still done so in most dictionaries):
Linguists recognize that the above list of eight word classes is drastically simplified and artificial. For example, "adverb" is to some extent a catch-all class that includes words with many different functions. Some have even argued that the most basic of category distinctions, that of nouns and verbs, is unfounded, or not applicable to certain languages. Although these eight are the traditional eight English parts of speech, modern linguists have been able to classify English words into even more specific categories and subcategories based on function.
The four main parts of speech in English, namely nouns, verbs, adjectives and adverbs, are labelled "form classes" as well. This is because prototypical members of each class share the ability to change their form by accepting derivational or inflectional morphemes. The term "form" is used because it refers literally to the similarities in shape of the word in its pronunciation and spelling for each part of speech.
Neither written nor spoken English generally marks words as belonging to one part of speech or another, as they tend to be understood in the context of the sentence. Words like neigh, break, outlaw, laser, microwave, and telephone might all be either verb forms or nouns. Although -ly is a frequent adverb marker, not all adverbs end in -ly (-wise is another common adverb marker) and not all words ending in -ly are adverbs. For instance, tomorrow, fast, very can all be adverbs, while early, friendly, ugly are all adjectives (though early can also function as an adverb). Verbs can also be used as adjectives (e.g. "The astonished child watched the spectacle unfold" instead of the verb usage "The unfolding spectacle astonished the child"). In such cases, the verb is in its participle form.
In certain circumstances, even words with primarily grammatical functions can be used as verbs or nouns, as in, "We must look to the hows and not just the whys."
The study of linguistics has expanded the understanding of lexical categories in various languages and allowed for better classifying words by function. Common lexical categories in English by function may include:
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