deepness vs depth

deepness and depth both are nouns.

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

As nouns, depth is a hypernym of deepness; that is, depth is a word with a broader meaning than deepness:

Other hypernyms of deepness include deepness.

As nouns, deepness and depth are synonyms defined as:

As nouns, deepness and depth are synonyms defined as:

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

Other synonyms of deepness include astuteness, profoundness, profundity.

deepness (noun)	depth (noun)
the quality of being physically deep	the extent downward or backward or inward
the extent downward or backward or inward	degree of psychological or intellectual profundity
a low pitch that is loud and voluminous	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
	(usually plural) a low moral state