fairy tale vs fib

fairy tale and fib both are nouns.

Word	Noun	Adjective	Verb	Adverb
fairy tale	Yes	No	No	No
fib	Yes	No	Yes	No

As nouns, fib is a hypernym of fairy tale; that is, fib is a word with a broader meaning than fairy tale:

fairy tale: an interesting but highly implausible story; often told as an excuse
fib: a trivial lie

Other hypernyms of fairy tale include story, tale, taradiddle, tarradiddle.

fairy tale (noun)	fib (noun)
a story about fairies; told to amuse children	a trivial lie
an interesting but highly implausible story; often told as an excuse

fairy tale (verb)	fib (verb)
	tell a relatively insignificant lie