aperture
arrearage
blank
breach
break
broaching
caesura
cavity
cessation
chasm
check
clearance
clearing
cleft
crack
defalcation
defect
deficiency
deficit
disclosure
discontinuity
distance between
double space
em space
en space
fenestra
fissure
fistula
fontanel
foramen
freeboard
gap
gape
gat
gulf
hair space
half space
hole
hollow
inlet
interim
intermediate space
intermission
interruption
interspace
interstice
piece
Olds
apprenticeship
enlistment
reprieve
residency
sabbatical
setback
sojourn
stint
tenure
warranty
Pilatus
comitatus
status