fit in vs gibe

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

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

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

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

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

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

fit in (verb)	gibe (verb)
go together	laugh at with contempt and derision
	be compatible, similar or consistent; coincide in their characteristics