2. 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. *WIKIPEDIA
3. Noun: a part of speech inflected for case, signifying a concrete or
abstract entity
Verb: a part of speech without case inflection, but inflected for
tense, person and number, signifying an activity or process
performed or undergone
Participle: a part of speech sharing the features of the verb and the
noun
Interjection: a part of speech expressing emotion alone
Pronoun: a part of speech substitutable for a noun and marked for a
person
Preposition: a part of speech placed before other words in
composition and in syntax
Adverb: a part of speech without inflection, in modification of or in
addition to a verb, adjective, clause, sentence, or other adverb
Conjunction: a part of speech binding together the discourse and
filling gaps in its interpretation
