aperture - a natural opening in something

bolt-hole - a hole through which an animal may bolt when pursued into its burrow or den

bullet hole - a hole made by a bullet passing through it

cranny - a small opening or crevice (especially in a rock face or wall)

leak - an accidental hole that allows something (fluid or light etc.) to enter or escape; "one of the tires developed a leak"

opening, gap - an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall"

ozone hole - an area of the ozone layer (near the poles) that is seasonally depleted of ozone

perforation - a hole made in something; "a perforation of the eardrum"

rathole - a hole (as in the wall of a building) made by rats

knothole - a hole in a board where a knot came out

air hole - a hole that allows the passage of air

armhole - a hole through which you put your arm and where a sleeve can be attached

bunghole - a hole in a barrel or cask; used to fill or empty it

button hole, buttonhole - a hole through which buttons are pushed

countersink - a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface

cup - the hole (or metal container in the hole) on a golf green; "he swore as the ball rimmed the cup and rolled away"; "put the flag back in the cup"

ear hole - a hole (as in a helmet) for sound to reach the ears

eye - a small hole or loop (as in a needle); "the thread wouldn't go through the eye"

eyelet - a small hole (usually round and finished around the edges) in cloth or leather for the passage of a cord

finger hole - a hole for inserting a finger

finger hole - one of a series of holes in a woodwind instrument; pitch changes when a finger covers it

hawse, hawsehole, hawsepipe - the hole that an anchor rope passes through

keyhole - the hole where a key is inserted

loophole - a small hole in a fortified wall; for observation or discharging weapons

lubber's hole - hole in a platform on a mast through which a sailor can climb without going out on the shrouds

manhole - a hole (usually with a flush cover) through which a person can gain access to an underground structure

mortice, mortise - a square hole made to receive a tenon and so to form a joint

mouth hole - a hole (as in a ski mask) for the mouth

nail hole - a hole left after a nail is removed

opening - a vacant or unobstructed space that is man-made; "they left a small opening for the cat at the bottom of the door"

peephole, spyhole - a hole (in a door or an oven etc) through which you can peep

perforation - a line of small holes for tearing at a particular place

plughole - a hole into which a plug fits (especially a hole where water drains away)

post hole, posthole - a hole dug in the ground to hold a fence post

puncture - a small hole made by a sharp object

sound hole - a hole in a soundboard (as of a violin) designed to resonate with the tones

thumbhole - the hole in a woodwind that is closed and opened with the thumb

vent, vent-hole, venthole, blowhole - a hole for the escape of gas or air

dogleg - a golf hole with a sharp angle in the fairway

golf course, golf links, links - course consisting of a large landscaped area for playing golf

period of play, playing period, play - (in games or plays or other performances) the time during which play proceeds; "rain stopped play in the 4th inning"

space - an empty area (usually bounded in some way between things); "the architect left space in front of the building"; "they stopped at an open space in the jungle"; "the space between his teeth"

pore - any tiny hole admitting passage of a liquid (fluid or gas)

burrow, tunnel - a hole in the ground made by an animal for shelter

gopher hole - a hole in the ground made by gophers

kettle hole, kettle - (geology) a hollow (typically filled by a lake) that results from the melting of a mass of ice trapped in glacial deposits

natural depression, depression - a sunken or depressed geological formation

cavity, pit - a sizeable hole (usually in the ground); "they dug a pit to bury the body"

chuckhole, pothole - a pit or hole produced by wear or weathering (especially in a road surface)

rabbit burrow, rabbit hole - a hole in the ground as a nest made by wild rabbits

wormhole - hole made by a burrowing worm

flaw, defect, fault - an imperfection in a device or machine; "if there are any defects you should send it back to the manufacturer"

difficulty - a condition or state of affairs almost beyond one's ability to deal with and requiring great effort to bear or overcome; "grappling with financial difficulties"

dog's breakfast, dog's dinner - a poor job; a mess; "they made a real dog's breakfast of that job"

mouth, oral cavity, oral fissure, rima oris - the opening through which food is taken in and vocalizations emerge; "he stuffed his mouth with candy"

golf, golf game - a game played on a large open course with 9 or 18 holes; the object is use as few strokes as possible in playing all the holes

hit - cause to move by striking; "hit a ball"

core out, hollow out, hollow - remove the interior of; "hollow out a tree trunk"