hymn vs doxology

hymn and doxology both are nouns.

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

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

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

hymn (noun)	doxology (noun)
a song of praise (to God or to a saint or to a nation)	a hymn or verse in Christian liturgy glorifying God

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