echo vs regurgitate

echo is a noun but regurgitate is not a noun.

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

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

Other hyponyms of echo include recite, cuckoo, reecho, parrot, reproduce.

echo (noun)	regurgitate (noun)
an imitation or repetition
the repetition of a sound resulting from reflection of the sound waves
a reflected television or radio or radar beam
a close parallel of a feeling, idea, style, etc.
a reply that repeats what has just been said

echo (verb)	regurgitate (verb)
to say again or imitate	eject the contents of the stomach through the mouth
ring or echo with sound	repeat after memorization
bring to mind	feed through the beak by regurgitating previously swallowed food
	pour or rush back