meaning vs idea

meaning and idea both are nouns.

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

As nouns, idea is a hypernym of meaning; that is, idea is a word with a broader meaning than meaning:

Other hypernyms of meaning include thought.

meaning (noun)	idea (noun)
the idea that is intended	the content of cognition; the main thing you are thinking about
the message that is intended or expressed or signified	your intention; what you intend to do
	an approximate calculation of quantity or degree or worth
	a personal view
	(music) melodic subject of a musical composition

meaning (adjective)	idea (adjective)
rich in significance or implication