accusative vs accuse

accusative is a noun but accuse is not a noun.

Word	Noun	Adjective	Verb	Adverb
accusative	Yes	Yes	No	No
accuse	No	No	Yes	No

accusative (noun)	accuse (noun)
the case of nouns serving as the direct object of a verb

accusative (adjective)	accuse (adjective)
serving as or indicating the object of a verb or of certain prepositions and used for certain other purposes
containing or expressing accusation

accusative (verb)	accuse (verb)
	bring an accusation against; level a charge against
	blame for, make a claim of wrongdoing or misbehavior against