sea floor vs ocean bottom

sea floor and ocean bottom both are nouns.

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

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

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

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