concord vs concur

concord is a noun but concur is not a noun.

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

As verbs, concord and concur are synonyms defined as:

Other synonyms of concord include agree, hold.

concord (noun)	concur (noun)
agreement of opinions
the determination of grammatical inflection on the basis of word relations
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

concord (verb)	concur (verb)
be in accord; be in agreement	happen simultaneously
arrange the words of a text so as to create a concordance	be in accord; be in agreement
arrange by concord or agreement
go together