concord vs blend in

concord is a noun but blend in is not a noun.

Word	Noun	Adjective	Verb	Adverb
concord	Yes	No	Yes	No
blend in	No	No	Yes	No

As verbs, blend in is a hyponym of concord; that is, blend in is a word with a more specific, narrower meaning than concord:

Other hyponyms of concord include coordinate, blend, go.

concord (noun)	blend in (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)	blend in (verb)
be in accord; be in agreement	cause (something) to be mixed with (something else)
arrange the words of a text so as to create a concordance	blend or harmonize
arrange by concord or agreement
go together