reverberation vs echo

reverberation and echo both are nouns.

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

As nouns, reverberation and echo are synonyms defined as:

reverberation and echo: the repetition of a sound resulting from reflection of the sound waves

Other synonyms of reverberation include replication, sound reflection.

reverberation (noun)	echo (noun)
the repetition of a sound resulting from reflection of the sound waves	an imitation or repetition
a remote or indirect consequence of some action	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