sea bottom vs ocean bottom

sea bottom and ocean bottom both are nouns.

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

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

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

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