assent vs agree

assent is a noun but agree is not a noun.

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

As verbs, agree is a hypernym of assent; that is, agree is a word with a broader meaning than assent:

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

assent (verb)	agree (verb)
to agree or express agreement	be in accord; be in 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