fib vs song and dance

fib and song and dance both are nouns.

Word	Noun	Adjective	Verb	Adverb
fib	Yes	No	Yes	No
song and dance	Yes	No	No	No

As nouns, song and dance is a hyponym of fib; that is, song and dance is a word with a more specific, narrower meaning than fib:

fib: a trivial lie
song and dance: an interesting but highly implausible story; often told as an excuse

Other hyponyms of fib include cock-and-bull story, fairy story, fairy tale, fairytale.

fib (noun)	song and dance (noun)
a trivial lie	theatrical performance combining singing and dancing
	an interesting but highly implausible story; often told as an excuse

fib (verb)	song and dance (verb)
tell a relatively insignificant lie