agreement vs assenting

agreement and assenting both are nouns.

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

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

agreement (noun)	assenting (noun)
compatibility of observations	agreeing with or consenting to (often unwillingly)
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

agreement (adjective)	assenting (adjective)
	expressing agreement or consent