deepness vs sounding

deepness and sounding both are nouns.

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

As nouns, sounding is a hyponym of deepness; that is, sounding is a word with a more specific, narrower meaning than deepness:

Other hyponyms of deepness include deepness, profoundness, profundity, draft, draught, penetration, shallowness.

deepness (noun)	sounding (noun)
the quality of being physically deep	the act of measuring depth of water (usually with a sounding line)
the extent downward or backward or inward	a measure of the depth of water taken with a sounding line
a low pitch that is loud and voluminous
the intellectual ability to penetrate deeply into ideas

deepness (adjective)	sounding (adjective)
	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