idealisation vs idea

idealisation and idea both are nouns.

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

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

Other hypernyms of idealisation include thought.

idealisation (noun)	idea (noun)
a portrayal of something as ideal	the content of cognition; the main thing you are thinking about
something that exists only as an idea	your intention; what you intend to do
(psychiatry) a defense mechanism that splits something you are ambivalent about into two representations--one good and one bad	an approximate calculation of quantity or degree or worth
	a personal view
	(music) melodic subject of a musical composition