deep vs deepness

deep and deepness both are nouns.

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

deep (noun)	deepness (noun)
a long steep-sided depression in the ocean floor	the quality of being physically deep
literary term for an ocean	the extent downward or backward or inward
the central and most intense or profound part	a low pitch that is loud and voluminous
	the intellectual ability to penetrate deeply into ideas

deep (adjective)	deepness (adjective)
having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination
relatively deep or strong; affecting one deeply
exhibiting great cunning usually with secrecy
strong; intense
very distant in time or space
difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge
of an obscure nature
intense or extreme
large in quantity or size
with head or back bent low
having or denoting a low vocal or instrumental range
marked by depth of thinking
relatively thick from top to bottom
extending relatively far inward
(of darkness) densely dark