agreement vs concord

agreement and concord both are nouns.

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

As nouns, concord is a hyponym of agreement; that is, concord is a word with a more specific, narrower meaning than agreement:

As nouns, agreement and concord are synonyms defined as:

agreement and concord: the determination of grammatical inflection on the basis of word relations

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

agreement: harmony of people's opinions or actions or characters
concord: a harmonious state of things in general and of their properties (as of colors and sounds); congruity of parts with one another and with the whole

Other hypernyms of agreement include concordance, harmony.

agreement (noun)	concord (noun)
compatibility of observations	agreement of opinions
the thing arranged or agreed to	the determination of grammatical inflection on the basis of word relations
the verbal act of agreeing	a harmonious state of things in general and of their properties (as of colors and sounds); congruity of parts with one another and with the whole
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)	concord (verb)
	be in accord; be in agreement
	arrange the words of a text so as to create a concordance
	arrange by concord or agreement
	go together