idea vs misconception

idea and misconception both are nouns.

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

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

idea (noun)	misconception (noun)
the content of cognition; the main thing you are thinking about	an incorrect conception
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