A
is a word that names a person, place, thing, or idea.
Noun
expresses an action or a state of being. Every sentence must have at least one.
Verb
describes or modifies a noun or pronoun. It tells you "which one," "what kind," or "how many.
Adjective
modifies a verb, an adjective, or another adverb. They often end in -ly and answer "how," "when," "where," or "to what extent.
Adverb
is a word used in place of a noun to avoid repetition.
Pronoun
shows the relationship (usually in time or space) between a noun/pronoun and another part of the sentence.
Preposition