sound reflection vs echo

sound reflection and echo both are nouns.

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

As nouns, sound reflection and echo are synonyms defined as:

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

Other synonyms of sound reflection include replication, reverberation.

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