hymn vs chorale

hymn and chorale both are nouns.

Word	Noun	Adjective	Verb	Adverb
hymn	Yes	No	Yes	No
chorale	Yes	No	No	No

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

Other hyponyms of hymn include dithyramb, doxology, choral, canticle, hymeneal, paean, pean, recessional.

hymn (noun)	chorale (noun)
a song of praise (to God or to a saint or to a nation)	a stately Protestant (especially Lutheran) hymn tune

hymn (verb)	chorale (verb)
praise by singing a hymn
sing a hymn