fairytale vs song and dance

fairytale and song and dance both are nouns.

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

As nouns, fairytale and song and dance are synonyms defined as:

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

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

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