Synonyms for Protrusion (same or very similar meaning)
WordNet sense 1 (something that bulges out or is protuberant or projects from its surroundings):
bulge, bump, excrescence, extrusion, hump, jut, prominence, protuberance, gibbosity, gibbousnessWordNet sense 2 (the act of projecting out from something):
projection, juttingFrom the ODE community, based on WordNetadd/edit