antiphonal vs antiphony

antiphonal and antiphony both are nouns.

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

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

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