antiphony vs antiphonal

antiphony and antiphonal both are nouns.

Word	Noun	Adjective	Verb	Adverb
antiphony	Yes	No	No	No
antiphonal	Yes	Yes	No	No

antiphony (noun)	antiphonal (noun)
alternate (responsive) singing by a choir in two parts	bound collection of antiphons
a verse or song to be chanted or sung in response

antiphony (adjective)	antiphonal (adjective)
	containing or using responses; alternating
	relating to or resembling an antiphon or antiphony