idealism vs romanticism

idealism and romanticism both are nouns.

Word	Noun	Adjective	Verb	Adverb
idealism	Yes	No	No	No
romanticism	Yes	No	No	No

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

idealism: impracticality by virtue of thinking of things in their ideal form rather than as they really are
romanticism: impractical romantic ideals and attitudes

Other hyponyms of idealism include knight errantry, quixotism.

idealism (noun)	romanticism (noun)
impracticality by virtue of thinking of things in their ideal form rather than as they really are	impractical romantic ideals and attitudes
elevated ideals or conduct; the quality of believing that ideals should be pursued	an exciting and mysterious quality (as of a heroic time or adventure)
(philosophy) the philosophical theory that ideas are the only reality