continental slope vs sea bottom

continental slope and sea bottom both are nouns.

Word	Noun	Adjective	Verb	Adverb
continental slope	Yes	No	No	No
sea bottom	Yes	No	No	No

As nouns, sea bottom is a hypernym of continental slope; that is, sea bottom is a word with a broader meaning than continental slope:

continental slope: the steep descent of the seabed from the continental shelf to the abyssal zone
sea bottom: the bottom of a sea or ocean

Other hypernyms of continental slope include Davy Jones's locker, Davy Jones, ocean bottom, ocean floor, sea floor, seabed.

continental slope (noun)	sea bottom (noun)
the steep descent of the seabed from the continental shelf to the abyssal zone	the bottom of a sea or ocean