antiphonal vs responsive

antiphonal is a noun but responsive is not a noun.

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

As adjectives, antiphonal and responsive are synonyms defined as:

antiphonal (noun)	responsive (noun)
bound collection of antiphons

antiphonal (adjective)	responsive (adjective)
containing or using responses; alternating	readily reacting or replying to people or events or stimuli; showing emotion
relating to or resembling an antiphon or antiphony	containing or using responses; alternating
	reacting to a stimulus