consensus vs agreement

consensus and agreement both are nouns.

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

As nouns, agreement is a hypernym of consensus; that is, agreement is a word with a broader meaning than consensus:

consensus: agreement in the judgment or opinion reached by a group as a whole
agreement: harmony of people's opinions or actions or characters

Other hypernyms of consensus include accord.

consensus (noun)	agreement (noun)
agreement in the judgment or opinion reached by a group as a whole	compatibility of observations
	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