concordant vs concordance

concordant is not a noun while concordance is a noun.

Word	Noun	Adjective	Verb	Adverb
concordant	No	Yes	No	No
concordance	Yes	No	No	No

concordant (noun)	concordance (noun)
	an index of all main words in a book along with their immediate contexts
	agreement of opinions
	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

concordant (adjective)	concordance (adjective)
being of the same opinion
in keeping