Synonyms to porthole

air hole, CAT, aerospace, aerosphere, air duct, air passage, air pocket, air shaft, air tube, airspace, airway, armhole, blowhole, breathing hole, bullet-hole, bump, bunghole, ceiling, cringle, crosswind, deadeye, empty space, eye, eyelet, favorable wind, fog, front, gasket, grommet, guide, head wind, high-pressure area, hole, ionosphere, jetstream, keyhole, knothole, loop, loophole, louver, louverwork, low-pressure area, manhole, mousehole, naris, nostril, overcast, peephole, pigeonhole, pinhole, placket, placket hole, pocket, punch-hole, roughness, shaft, soup, space, spilehole, spiracle, stratosphere, substratosphere, tail wind, tap, touchhole, transom, tropopause, troposphere, trough, turbulence, vent, ventage, venthole, ventiduct, ventilating shaft, ventilator, visibility, visibility zero, wind tunnel, bay window, abdomen, abomasum, bay, beerbelly, belly, bow window, breadbasket, casement, casement window, corporation, craw, crop, diaphragm, embonpoint, fan window, fanlight, first stomach, gizzard, grille, gullet, gut, honeycomb stomach, kishkes, lancet window, lantern, lattice, light, louver window,