echo vs sound reflection

echo and sound reflection both are nouns.

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

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

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

Other synonyms of echo include replication, reverberation.

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