visionary vs idealist

visionary and idealist both are nouns.

Word	Noun	Adjective	Verb	Adverb
visionary	Yes	Yes	No	No
idealist	Yes	No	No	No

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

visionary: a person given to fanciful speculations and enthusiasms with little regard for what is actually possible
idealist: someone guided more by ideals than by practical considerations

Other hyponyms of visionary include dreamer.

visionary (noun)	idealist (noun)
a person with unusual powers of foresight	someone guided more by ideals than by practical considerations
a person given to fanciful speculations and enthusiasms with little regard for what is actually possible

visionary (adjective)	idealist (adjective)
not practical or realizable; speculative