Contains
- aperture
A natural opening in something.
- perforation
A hole made in something; "a perforation of the eardrum".
- bullet hole
A hole made by a bullet passing through it.
- knothole
A hole in a board where a knot came out.
- ozone hole
An area of the ozone layer (near the poles) that is seasonally depleted of ozone.
- bolt-hole
A hole through which an animal may bolt when pursued into its burrow or den.
- leak
An accidental hole that allows something (fluid or light etc.) to enter or escape; "one of...
- rathole
A hole (as in the wall of a building) made by rats.
- cranny
A small opening or crevice (especially in a rock face or wall).