hearable vs sounding

hearable is not a noun while sounding is a noun.

Word	Noun	Adjective	Verb	Adverb
hearable	No	Yes	No	No
sounding	Yes	Yes	No	No

hearable (noun)	sounding (noun)
	the act of measuring depth of water (usually with a sounding line)
	a measure of the depth of water taken with a sounding line

hearable (adjective)	sounding (adjective)
heard or perceptible by the ear	making or having a sound as specified; used as a combining form
	having volume or deepness
	appearing to be as specified; usually used as combining forms