echo sounding vs localisation

echo sounding and localisation both are nouns.

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

As nouns, localisation is a hypernym of echo sounding; that is, localisation is a word with a broader meaning than echo sounding:

echo sounding: determining the location of something by measuring the time it takes for an echo to return from it
localisation: a determination of the place where something is

Other hypernyms of echo sounding include fix, localization, locating, location.

echo sounding (noun)	localisation (noun)
determining the location of something by measuring the time it takes for an echo to return from it	a determination of the place where something is
	(physiology) the principle that specific functions have relatively circumscribed locations in some particular part or organ of the body