sea bottom vs sea floor

sea bottom and sea floor both are nouns.

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

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

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

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