ocean floor vs ocean bottom

ocean floor and ocean bottom both are nouns.

Word	Noun	Adjective	Verb	Adverb
ocean floor	Yes	No	No	No
ocean bottom	Yes	No	No	No

As nouns, ocean floor and ocean bottom are synonyms defined as:

Other synonyms of ocean floor include Davy Jones's locker, Davy Jones, sea bottom, sea floor, seabed.

ocean floor (noun)	ocean bottom (noun)
the bottom of a sea or ocean	the bottom of a sea or ocean