is a specific kind of: projection.

is a broader term that covers: frontal eminence | occipital protuberance | belly | caput | mogul | nub, nubble | snag | wart.

derivation: bulge, bulk | bulge, pouch, protrude | hump, hunch, hunch forward, hunch over | bug out, bulge, bulge out, come out, pop, pop out, protrude, start | bag, bulge | protuberate | crookback, crookbacked, gibbous, humpbacked, humped, hunchbacked, kyphotic | bellied, bellying, bulbous, bulging, bulgy, protuberant | excrescent.