WordNet sense 1 (something that bulges out or is protuberant or projects from its surroundings):

bump, excrescence, extrusion, hump, jut, prominence, protrusion, protuberance, gibbosity, gibbousness

WordNet sense 2 (bulge out; form a bulge outward, or be so full as to appear to bulge):

bag

WordNet sense 3 (bulge outward):

pop, protrude, start, pop out, come out, bug out, bulge out

WordNet sense 4 (swell or protrude outwards):

pouch

WordNet sense 5 (cause to bulge or swell outwards):

bulk