echo sounding vs echolocation

echo sounding and echolocation both are nouns.

Word	Noun	Adjective	Verb	Adverb
echo sounding	Yes	No	No	No
echolocation	Yes	No	No	No

As nouns, echo sounding and echolocation are synonyms defined as:

echo sounding and echolocation: determining the location of something by measuring the time it takes for an echo to return from it

echo sounding (noun)	echolocation (noun)
determining the location of something by measuring the time it takes for an echo to return from it	determining the location of something by measuring the time it takes for an echo to return from it