concord vs fit in

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

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

As verbs, concord and fit in are synonyms defined as:

Other synonyms of concord include accord, agree, consort, harmonise, harmonize.

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