re-echo vs sound reflection

re-echo and sound reflection both are nouns.

Word	Noun	Adjective	Verb	Adverb
re-echo	Yes	No	No	No
sound reflection	Yes	No	No	No

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

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

Other hypernyms of re-echo include echo, replication, reverberation.

re-echo (noun)	sound reflection (noun)
the echo of an echo	the repetition of a sound resulting from reflection of the sound waves