abyssal vs deep

abyssal is not a noun while deep is a noun.

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

abyssal (noun)	deep (noun)
	a long steep-sided depression in the ocean floor
	literary term for an ocean
	the central and most intense or profound part

abyssal (adjective)	deep (adjective)
relating to ocean depths from 2000 to 5000 meters	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
resembling an abyss in depth; so deep as to be unmeasurable	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