fit in vs jibe

fit in is not a noun while jibe is a noun.

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

As verbs, jibe is a hypernym of fit in; that is, jibe is a word with a broader meaning than fit in:

fit in: go together
jibe: be compatible, similar or consistent; coincide in their characteristics

Other hypernyms of fit in include agree, check, correspond, fit, gibe, match, tally.

fit in (noun)	jibe (noun)
	an aggressive remark directed at a person like a missile and intended to have a telling effect

fit in (verb)	jibe (verb)
go together	shift from one side of the ship to the other
	be compatible, similar or consistent; coincide in their characteristics