endorsement vs agreement

endorsement and agreement both are nouns.

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

As nouns, agreement is a hypernym of endorsement; that is, agreement is a word with a broader meaning than endorsement:

endorsement (noun)	agreement (noun)
the act of endorsing	compatibility of observations
formal and explicit approval	the thing arranged or agreed to
a promotional statement (as found on the dust jackets of books)	the verbal act of agreeing
a speech seconding a motion	the statement (oral or written) of an exchange of promises
a signature that validates something	the determination of grammatical inflection on the basis of word relations
	harmony of people's opinions or actions or characters