gradual vs antiphon

gradual and antiphon both are nouns.

Word	Noun	Adjective	Verb	Adverb
gradual	Yes	Yes	No	No
antiphon	Yes	No	No	No

As nouns, antiphon is a hypernym of gradual; that is, antiphon is a word with a broader meaning than gradual:

gradual: (Roman Catholic Church) an antiphon (usually from the Book of Psalms) immediately after the epistle at Mass
antiphon: a verse or song to be chanted or sung in response

Other hypernyms of gradual include antiphony.

gradual (noun)	antiphon (noun)
(Roman Catholic Church) an antiphon (usually from the Book of Psalms) immediately after the epistle at Mass	a verse or song to be chanted or sung in response

gradual (adjective)	antiphon (adjective)
proceeding in small stages
(of a topographical gradient) not steep or abrupt