agree vs agreement

agree is not a noun while agreement is a noun.

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

agree (noun)	agreement (noun)
	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

agree (verb)	agreement (verb)
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