responsive vs respondent

responsive is not a noun while respondent is a noun.

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

responsive (noun)	respondent (noun)
	someone who responds
	the codefendant (especially in a divorce proceeding) who is accused of adultery with the corespondent

responsive (adjective)	respondent (adjective)
readily reacting or replying to people or events or stimuli; showing emotion	replying
containing or using responses; alternating
reacting to a stimulus