response vs echo

response and echo both are nouns.

Word	Noun	Adjective	Verb	Adverb
response	Yes	No	No	No
echo	Yes	No	Yes	No

As nouns, echo is a hyponym of response; that is, echo is a word with a more specific, narrower meaning than response:

response (noun)	echo (noun)
a bodily process occurring due to the effect of some antecedent stimulus or agent	an imitation or repetition
the manner in which an electrical or mechanical device responds to an input signal or a range of input signals	the repetition of a sound resulting from reflection of the sound waves
the speech act of continuing a conversational exchange	a reflected television or radio or radar beam
a statement (either spoken or written) that is made to reply to a question or request or criticism or accusation	a close parallel of a feeling, idea, style, etc.
the manner in which something is greeted	a reply that repeats what has just been said
a phrase recited or sung by the congregation following a versicle by the priest or minister
a result