tune vs idea

tune and idea both are nouns.

Word	Noun	Adjective	Verb	Adverb
tune	Yes	No	Yes	No
idea	Yes	No	No	No

As nouns, idea is a hyponym of tune; that is, idea is a word with a more specific, narrower meaning than tune:

tune (noun)	idea (noun)
the adjustment of a radio receiver or other circuit to a required frequency	the content of cognition; the main thing you are thinking about
the property of producing accurately a note of a given pitch	your intention; what you intend to do
a succession of notes forming a distinctive sequence	an approximate calculation of quantity or degree or worth
	a personal view
	(music) melodic subject of a musical composition

tune (verb)	idea (verb)
adjust the pitches of (musical instruments)
adjust for (better) functioning