noun
1.
something which extends beyond a level or a normal outer surface
buttresses are projections which serve to support a wall
Synonyms: bulge, jut, outthrust, protrusion, protuberance
Related Word: bump, bunch, swelling; extension, prolongation; hook, knob, point, spine, spur
Antonyms: depression
2.
Synonyms: eminence 3, prominence