re-echo vs reverberation

re-echo and reverberation both are nouns.

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

As nouns, reverberation is a hypernym of re-echo; that is, reverberation is a word with a broader meaning than re-echo:

re-echo: the echo of an echo
reverberation: the repetition of a sound resulting from reflection of the sound waves

Other hypernyms of re-echo include echo, replication, sound reflection.

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