deep vs unfathomable

deep is a noun but unfathomable is not a noun.

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

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

deep (adjective)	unfathomable (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	of depth; not capable of being sounded or measured
relatively deep or strong; affecting one deeply	resembling an abyss in depth; so deep as to be unmeasurable
exhibiting great cunning usually with secrecy	incapable of being fully understood
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