air duct
air hole
air passage
air shaft
air tube
airway
armhole
avenue
breathing hole
bullet-hole
bunghole
channel
chute
cringle
deadeye
debouch
door
egress
emunctory
escape
estuary
exhaust
exit
eye
eyelet
floodgate
flume
gasket
grommet
guide
keyhole
knothole
loop
loophole
louver
louverwork
manhole
mousehole
naris
nostril
opening
out
outcome
outfall
outgate
outgo
outlet
peephole
pigeonhole
pinhole
spiracle
affusion
cindery
homebuilders
line-back
snorkel