bathyal district vs continental slope

bathyal district and continental slope both are nouns.

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

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

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

Other synonyms of bathyal district include bathyal zone.

bathyal district (noun)	continental slope (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