antiphony vs antiphon

antiphony and antiphon both are nouns.

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

As nouns, antiphony and antiphon are synonyms defined as:

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

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