WordNet (r) 3.0 (2006):
pinhole n 1: a small puncture that might have been made by a pinMoby Thesaurus II by Grady Ward, 1.0:
28 Moby Thesaurus words for "pinhole": air hole, armhole, blowhole, bullet-hole, bunghole, cringle, deadeye, eye, eyelet, gasket, grommet, guide, keyhole, knothole, loop, loophole, manhole, mousehole, peephole, pigeonhole, placket, placket hole, porthole, punch-hole, spiracle, tap, vent, venthole