A
part of speech (abbreviated form:
PoS or
POS) is a category of words (or, more generally, of
lexical items) which have similar
grammatical properties. Words that are assigned to the same part of speech generally display similar behavior in terms of
syntax—they play similar roles within the grammatical structure of sentences—and sometimes in terms of
morphology, in that they undergo
inflection for similar properties. Commonly listed
English parts of speech are
noun,
verb,
adjective,
adverb,
pronoun,
preposition,
conjunction,
interjection, and sometimes
numeral,
article or
determiner.