pinhole

noun 0.600

orifice

noun 0.589

piriform aperture

noun 0.575

air hole

noun 0.572

foramen

noun 0.569

fenestra

noun 0.568

lens

noun 0.567

open

noun 0.566

opening

noun 0.563

open door

noun 0.557

gate

noun 0.554

gap

noun 0.553

gape

noun 0.551

doorway

noun 0.549

gaping

noun 0.549

window

noun 0.548

perforation

noun 0.548

eyehole

noun 0.546

shutter

noun 0.546

pore

noun 0.545

peephole

noun 0.543

archway

noun 0.540

porthole

noun 0.537

portal

noun 0.537

appliance

noun 0.534

access point

noun 0.534

porosity

noun 0.534

openness

noun 0.534

keyhole

noun 0.533

slit

noun 0.533

speculum

noun 0.533

door

noun 0.530

sound hole

noun 0.530

anteroom

noun 0.530

stoma

noun 0.529

lumen

noun 0.526

ostium

noun 0.526

fontanelle

noun 0.524

apophysis

noun 0.522

air vent

noun 0.522

ape

noun 0.522

gateway

noun 0.521

hole

noun 0.519

opportunity

noun 0.519

opusculum

noun 0.519

dilation

noun 0.519

earhole

noun 0.519

vestibule

noun 0.518

air pocket

noun 0.518

opener

noun 0.518

osculum

noun 0.517

cavity

noun 0.516

skylight

noun 0.516

diaphragm

noun 0.516

valve

noun 0.515

telescope

noun 0.515

diameter

noun 0.513

apparatus

noun 0.513

atrium

noun 0.512

tunnel

noun 0.512

fenestration

noun 0.512

entrance

noun 0.511

camera

noun 0.511

apsis

noun 0.509

loophole

noun 0.508

knothole

noun 0.507

passageway

noun 0.506

apron

noun 0.506

black hole

noun 0.506

visual angle

noun 0.506

fissure

noun 0.505

opacity

noun 0.504

exposure

noun 0.504

embrasure

noun 0.503

opening time

noun 0.502

fenestral

noun 0.502

cranny

noun 0.502

chamber

noun 0.502

armhole

noun 0.502

spyhole

noun 0.502

apt

noun 0.502

gauge

noun 0.502

apa

noun 0.501

abri

noun 0.501