respond vs refuse

respond is not a noun while refuse is a noun.

Word	Noun	Adjective	Verb	Adverb
respond	No	No	Yes	No
refuse	Yes	No	Yes	No

As verbs, refuse is a hyponym of respond; that is, refuse is a word with a more specific, narrower meaning than respond:

respond (noun)	refuse (noun)
	food that is discarded (as from a kitchen)

respond (verb)	refuse (verb)
show a response or a reaction to something	show unwillingness towards
respond favorably or as hoped	not accept as true
react verbally	refuse to let have
	refuse entrance or membership
	elude, especially in a baffling way
	resist immunologically the introduction of some foreign tissue or organ