ocean bottom vs sea floor

ocean bottom and sea floor both are nouns.

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

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

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

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