bottom vs bottommost

bottom is a noun but bottommost is not a noun.

Word	Noun	Adjective	Verb	Adverb
bottom	Yes	Yes	Yes	No
bottommost	No	Yes	No	No

bottom (noun)	bottommost (noun)
a cargo ship
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)	bottommost (adjective)
situated at the bottom or lowest position	farthest down
the lowest rank

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