answer vs fit

answer and fit both are nouns.

Word	Noun	Adjective	Verb	Adverb
answer	Yes	No	Yes	No
fit	Yes	Yes	Yes	No

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

answer: be satisfactory for; meet the requirements of or serve the purpose of
fit: fill, satisfy or meet a want or need or condition or restriction

Other hypernyms of answer include conform to, fill, fulfil, fulfill, meet, satisfy.

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

answer: match or correspond
fit: be compatible, similar or consistent; coincide in their characteristics

Other hypernyms of answer include agree, check, correspond, gibe, jibe, match, tally.

answer (noun)	fit (noun)
a nonverbal reaction	a sudden flurry of activity (often for no obvious reason)
the speech act of replying to a question	the manner in which something fits
a statement (either spoken or written) that is made to reply to a question or request or criticism or accusation	a sudden uncontrollable attack
a statement that solves a problem or explains how to solve the problem	a display of bad temper
the principal pleading by the defendant in response to plaintiff's complaint; in criminal law it consists of the defendant's plea of `guilty' or `not guilty' (or nolo contendere); in civil law it must contain denials of all allegations in the plaintiff's complaint that the defendant hopes to controvert and it can contain affirmative defenses or counterclaims

answer (adjective)	fit (adjective)
	physically and mentally sound or healthy
	meeting adequate standards for a purpose
	(usually followed by `to' or `for') on the point of or strongly disposed

answer (verb)	fit (verb)
give the correct answer or solution to	make correspond or harmonize
respond to a signal	make fit
understand the meaning of	insert or adjust several objects or people
react to a stimulus or command	fill, satisfy or meet a want or need or condition or restriction
react verbally	provide with (something) usually for a specific purpose
give a defence or refutation of (a charge) or in (an argument)	be the right size or shape; fit correctly or as desired
be satisfactory for; meet the requirements of or serve the purpose of	conform to some shape or size
match or correspond	be compatible, similar or consistent; coincide in their characteristics
be liable or accountable	be agreeable or acceptable to
be sufficient; be adequate, either in quality or quantity