sea bottom vs ocean floor

sea bottom and ocean floor both are nouns.

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

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

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

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