generalisation vs idea

generalisation and idea both are nouns.

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

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

Other hypernyms of generalisation include thought.

generalisation (noun)	idea (noun)
an idea or conclusion having general application	the content of cognition; the main thing you are thinking about
reasoning from detailed facts to general principles	your intention; what you intend to do
(psychology) transfer of a response learned to one stimulus to a similar stimulus	an approximate calculation of quantity or degree or worth
the process of formulating general concepts by abstracting common properties of instances	a personal view
	(music) melodic subject of a musical composition