antiphon vs antiphony

antiphon and antiphony both are nouns.

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

As nouns, antiphon and antiphony are synonyms defined as:

antiphon and antiphony: a verse or song to be chanted or sung in response

antiphon (noun)	antiphony (noun)
a verse or song to be chanted or sung in response	alternate (responsive) singing by a choir in two parts
	a verse or song to be chanted or sung in response