agreement vs agree

agreement is a noun but agree is not a noun.

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

agreement (noun)	agree (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

agreement (verb)	agree (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