bottom vs sea floor

bottom and sea floor both are nouns.

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

As nouns, sea floor is a hyponym of bottom; that is, sea floor is a word with a more specific, narrower meaning than bottom:

bottom (noun)	sea floor (noun)
a cargo ship	the bottom of a sea or ocean
the fleshy part of the human body that you sit on
the lower side of anything
the lowest part of anything
a depression forming the ground under a body of water
low-lying alluvial land near a river
the second half of an inning; while the home team is at bat

bottom (adjective)	sea floor (adjective)
situated at the bottom or lowest position
the lowest rank

bottom (verb)	sea floor (verb)
come to understand
strike the ground, as with a ship's bottom
provide with a bottom or a seat