deepness vs profundity

deepness and profundity both are nouns.

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

As nouns, deepness and profundity are synonyms defined as:

Other synonyms of deepness include profoundness.

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

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

As nouns, deepness and profundity are synonyms defined as:

deepness and profundity: the intellectual ability to penetrate deeply into ideas

Other synonyms of deepness include astuteness, depth, profoundness.

deepness (noun)	profundity (noun)
the quality of being physically deep	the quality of being physically deep
the extent downward or backward or inward	intellectual depth, penetrating knowledge, keen insight, etc; "the depth of my feeling"; "the profoundness of the silence"
a low pitch that is loud and voluminous	the intellectual ability to penetrate deeply into ideas
the intellectual ability to penetrate deeply into ideas	wisdom that is recondite and abstruse and profound