adit
aerospace
aerosphere
air hole
air pocket
airspace
alveolation
alveolus
amplitude
antinode
antrum
aqueduct
armpit
basin
billow
bore
bottom
bottom glade
bottoms
bowl
breakers
bump
burrow
canal
canalization
canalize
carve
cavity
ceiling
chamfer
channel
chisel
chop
choppiness
chopping sea
chute
comb
comber
concave
concavity
conduit
corrugate
course
crack
crater
crest
crimp
crosswind
crypt
cup
concave shape
exchequer
incurvation
incurvature
treasury
bucket
cavern
chasm
container
ditch
drain
enclosure
groove
mound
pan
pit
pond
ravine
reservoir
ridge
slab
tray
trench
tub
vat
Christophe
Hoff
Prof.
bake-off
boff
cough
doff
goff
hoff
jerk-off
koff
lauf
off
roff
schroff
scoff
shroff
skoff