continental slope vs bathyal district

continental slope and bathyal district both are nouns.

Word	Noun	Adjective	Verb	Adverb
continental slope	Yes	No	No	No
bathyal district	Yes	No	No	No

As nouns, continental slope and bathyal district are synonyms defined as:

continental slope and bathyal district: the steep descent of the seabed from the continental shelf to the abyssal zone

Other synonyms of continental slope include bathyal zone.

continental slope (noun)	bathyal district (noun)
the steep descent of the seabed from the continental shelf to the abyssal zone	the steep descent of the seabed from the continental shelf to the abyssal zone