#1 protrude v. [stick out, jut out, jut, project] extend out or project in space; "His sharp nose jutted out"; "A single rock sticks out from the cliff". wn
#2 protrude v. [start, pop, pop out, bulge, bulge out, bug out, come out] bulge outward; "His eyes popped". wn
#3 protrude v. [bulge, pouch] swell or protrude outwards; "His stomach bulged after the huge meal". wn
vizzz