song and dance vs taradiddle

song and dance and taradiddle both are nouns.

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

As nouns, taradiddle is a hypernym of song and dance; that is, taradiddle is a word with a broader meaning than song and dance:

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

Other hypernyms of song and dance include fib, story, tale, tarradiddle.

song and dance (noun)	taradiddle (noun)
theatrical performance combining singing and dancing	a trivial lie
an interesting but highly implausible story; often told as an excuse	pretentious or silly talk or writing