song and dance vs fairy story

song and dance and fairy story both are nouns.

Word	Noun	Adjective	Verb	Adverb
song and dance	Yes	No	No	No
fairy story	Yes	No	No	No

As nouns, song and dance and fairy story are synonyms defined as:

song and dance and fairy story: an interesting but highly implausible story; often told as an excuse

Other synonyms of song and dance include cock-and-bull story, fairy tale, fairytale.

song and dance (noun)	fairy story (noun)
theatrical performance combining singing and dancing	a story about fairies; told to amuse children
an interesting but highly implausible story; often told as an excuse	an interesting but highly implausible story; often told as an excuse