fit in vs harmonize

fit in and harmonize both are verbs.

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

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

Other synonyms of fit in include accord, agree, concord, consort, harmonise.

fit in (verb)	harmonize (verb)
go together	bring into consonance, harmony, or accord while making music or singing
	bring into consonance or accord
	bring (several things) into consonance or relate harmoniously
	sing or play in harmony
	write a harmony for
	go together