[nown] a word (other than a pronoun) used to identify any of a class of people, places, or things common noun, or to name a particular one of these proper noun.
[in-ter-jek-shuh n] words expressing emotion, distinguished in most languages by their use in grammatical isolation, as Hey! Oh! Ouch! Ugh!
[aj-ik-tiv] Words that modify nouns and pronouns, primarily by describing a particular quality of the word they are modifying, as wise in a wise grandmother, or perfect in a perfect score, or handsome in He is extremely handsome.