agreement vs unanimity

agreement and unanimity both are nouns.

Word	Noun	Adjective	Verb	Adverb
agreement	Yes	No	No	No
unanimity	Yes	No	No	No

As nouns, unanimity is a hyponym of agreement; that is, unanimity is a word with a more specific, narrower meaning than agreement:

agreement (noun)	unanimity (noun)
compatibility of observations	everyone being of one mind
the thing arranged or agreed to
the verbal act of agreeing
the statement (oral or written) of an exchange of promises
the determination of grammatical inflection on the basis of word relations
harmony of people's opinions or actions or characters