Part of speech is a term used to describe the function of words in a sentence. A noun is a WORD that names a person, place, thing, or idea. An ADVERB is a WORD that modifies or describes a verb, an adjective, or another ADVERB. A verb is a WORD that expresses action or being. A CONJUNCTION is a WORD that connects words, phrases, or clauses. A PRONOUN is a WORD that takes the place of a noun. Lastly, a WORD is a unit of language that carries meaning and consists of one or more written or spoken sounds.