idealism vs high-mindedness

idealism and high-mindedness both are nouns.

Word	Noun	Adjective	Verb	Adverb
idealism	Yes	No	No	No
high-mindedness	Yes	No	No	No

As nouns, idealism and high-mindedness are synonyms defined as:

idealism and high-mindedness: elevated ideals or conduct; the quality of believing that ideals should be pursued

Other synonyms of idealism include noble-mindedness.

idealism (noun)	high-mindedness (noun)
impracticality by virtue of thinking of things in their ideal form rather than as they really are	elevated ideals or conduct; the quality of believing that ideals should be pursued
elevated ideals or conduct; the quality of believing that ideals should be pursued
(philosophy) the philosophical theory that ideas are the only reality