See knob in Webster's New World Roget's A-Z Thesaurus II
noun
A part that protrudes or extends outward:
bulge, jut, knot, overhang, projection, protrusion, protuberance. See convexAn unevenness or elevation on a surface:
bump, hump, knot, lump1, nub, protuberance. See convex
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