Lexical category
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In grammar, a lexical category (also word class, lexical class, or in traditional grammar
part of speech) is a linguistic category of words (or more precisely lexical items) that are
usually defined by their particular syntactic or morphological behaviours. 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.
Not all languages have the same lexical categories, and lexical categories generally
considered equivalent between two languages may have different properties. For example,
Spanish uses adjectives almost interchangeably as nouns while English cannot; Japanese
has two classes of adjectives where English has one; Chinese and Japanese have measure
words while European languages strictly speaking don't; many languages do not have a
distinction between adjectives and adverbs, or adjectives and nouns, etc. Many linguists
argue that the formal distinctions between parts of speech must be made within the
framework of a specific language or language family, and should not be carried over to
other languages or language families.
Common ways of delimiting words by function include:

Open word classes:
o adjectives
o adverbs
o interjections
o nouns
o verbs (except auxiliary verbs)

Closed word classes:
o auxiliary verbs
o clitics
o coverbs
o conjunctions
o determiners (articles, quantifiers, demonstrative adjectives, and possessive
adjectives)
o particles
o measure words
o adpositions (prepositions, postpositions, and circumpositions)
o preverbs
o
o
o
pronouns
contractions
cardinal numbers
Contents
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1 Traditional "parts of speech"
2 English
3 See also
4 External links
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Traditional "parts of speech"
In traditional English grammar, which is patterned after Latin grammar, and still taught in
schools and used in dictionaries, there are eight parts of speech: noun, verb, adjective,
adverb, pronoun, preposition, conjunction, and interjection. Modern grammarians
however believe that this list is simplified and artificial. Many traditional parts of speech
are defined by semantic criteria instead of morpho-syntactic criteria. For example,
"adverb" is to some extent a catch-all class that includes words with many different
functions. Numbering eight parts of speech is traditional; it stems from the Greek
grammarians. When Romans decided on writing a grammar for their language, they felt
compelled to have eight parts of speech, though these were different from the Greek ones,
and the same is the case for the English set.
[edit]
English
English is an analytic language and frequently does not mark words as belonging to one
part of speech or another. Words like neigh, break, outlaw, laser, microwave and
telephone might all be either verb forms or nouns. Although -ly is an adverb marker, not
all adverbs end in -ly and not all words ending in -ly are adverbs. For instance, tomorrow,
slow, fast, crosswise can all be adverbs, while leisurely, friendly, ugly are all adjectives.
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" or "Miranda
was to-ing and fro-ing and not paying attention".