respond vs counter

respond is not a noun while counter is a noun.

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

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

Other hyponyms of respond include call back, field, sass, come back, rejoin, repay, retort, return, riposte, bridle.

respond (noun)	counter (noun)
	a return punch (especially by a boxer)
	table consisting of a horizontal surface over which business is transacted
	a calculator that keeps a record of the number of times something happens
	a piece of leather forming the back of a shoe or boot
	game equipment (as a piece of wood, plastic, or ivory) used for keeping a count or reserving a space in various card or board games
	a piece of furniture that stands at the side of a dining room; has shelves and drawers
	(computer science) a register whose contents go through a regular series of states (usually states indicating consecutive integers)
	a quick reply to a question or remark (especially a witty or critical one)
	a person who counts things

respond (adjective)	counter (adjective)
	indicating opposition or resistance

respond (verb)	counter (verb)
show a response or a reaction to something	speak in response
respond favorably or as hoped	act in advance of; deal with ahead of time
react verbally

respond (adverb)	counter (adverb)
	in the opposite direction