depth vs profoundness

depth and profoundness both are nouns.

Word	Noun	Adjective	Verb	Adverb
depth	Yes	No	No	No
profoundness	Yes	No	No	No

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

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

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

depth: degree of psychological or intellectual profundity
profoundness: intellectual depth, penetrating knowledge, keen insight, etc; "the depth of my feeling"; "the profoundness of the silence"

Other hyponyms of depth include profundity, shallowness, superficiality.

As nouns, depth and profoundness are synonyms defined as:

depth and profoundness: the intellectual ability to penetrate deeply into ideas

Other synonyms of depth include astuteness, deepness, profundity.

depth (noun)	profoundness (noun)
the extent downward or backward or inward	the quality of being physically deep
degree of psychological or intellectual profundity	intellectual depth, penetrating knowledge, keen insight, etc; "the depth of my feeling"; "the profoundness of the silence"
the attribute or quality of being deep, strong, or intense	the intellectual ability to penetrate deeply into ideas
the intellectual ability to penetrate deeply into ideas	wisdom that is recondite and abstruse and profound
(usually plural) a low moral state	extremeness of degree