fairytale vs cock-and-bull story

fairytale and cock-and-bull story both are nouns.

Word	Noun	Adjective	Verb	Adverb
fairytale	Yes	No	No	No
cock-and-bull story	Yes	No	No	No

As nouns, fairytale and cock-and-bull story are synonyms defined as:

fairytale and cock-and-bull story: an interesting but highly implausible story; often told as an excuse

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

fairytale (noun)	cock-and-bull story (noun)
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