alveolation
alveolus
antrum
aperture
armpit
arrearage
basin
bowl
breach
break
broaching
caesura
cavity
cessation
chasm
check
clearance
clearing
cleft
concave
concavity
crack
crater
crypt
cup
defalcation
defect
deficiency
deficit
depression
dip
disclosure
discontinuity
distance between
double space
em space
en space
fenestra
fissure
fistula
fold
follicle
fontanel
foramen
freeboard
funnel chest
gap
gape
gat
lacunae
panel
agoe
allude
archenemy
blowing-up
country
family
lute-player
mountain-peak
out-manoeuvred
overextension
resplendence
room
shaming
skies'
spanner
stitchwort
striver
tear-drop
tenting
toread
tulip-fancier