fill the bill vs fit the bill

fill the bill and fit the bill both are verbs.

Word	Noun	Adjective	Verb	Adverb
fill the bill	No	No	Yes	No
fit the bill	No	No	Yes	No

As verbs, fill the bill and fit the bill are synonyms defined as:

fill the bill and fit the bill: be what is needed or be good enough for what is required

fill the bill (verb)	fit the bill (verb)
be what is needed or be good enough for what is required	be what is needed or be good enough for what is required