ocean floor vs sea bottom

ocean floor and sea bottom both are nouns.

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

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

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

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