agree vs assent

agree is not a noun while assent is a noun.

Word	Noun	Adjective	Verb	Adverb
agree	No	No	Yes	No
assent	Yes	No	Yes	No

As verbs, assent is a hyponym of agree; that is, assent is a word with a more specific, narrower meaning than agree:

Other hyponyms of agree include plea-bargain, bargain, accede, acquiesce.

agree (noun)	assent (noun)
	agreement with a statement or proposal to do something

agree (verb)	assent (verb)
be in accord; be in agreement	to agree or express agreement
consent or assent to a condition, or agree to do something
achieve harmony of opinion, feeling, or purpose
be agreeable or suitable
be compatible, similar or consistent; coincide in their characteristics
go together
show grammatical agreement