nouns
the lower side of anything
the lowest part of anything
"they started at the bottom of the hill"
is a type of (narrower)
the extended spatial location of something
"the farming regions of France"; "religions in all parts of the world"; "regions of outer space"
the fleshy part of the human body that you sit on
"he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing?"
arse,
ass,
backside,
behind,
bottom,
bum,
buns,
butt,
buttocks,
can,
derriere,
fanny,
fundament,
hind end,
hindquarters,
keister,
nates,
posterior,
prat,
rear,
rear end,
rump,
seat,
stern,
tail,
tail end,
tooshie,
tush
the second half of an inning; while the home team is at bat
a depression forming the ground under a body of water
"he searched for treasure on the ocean bed"
low-lying alluvial land near a river
a cargo ship
"they did much of their overseas trade in foreign bottoms"