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Projection vs Protrusion vs Protuberance vs Bulge

Projection, protrusionprotuberancebulge all denote something which extends beyond a level or a normal outer surface.

Projection is applicable to anything that juts out, especially at a sharp angle.

Protrusion applies to something which is thrust out or which pushes out so that it seems an excrescence or deformity.

protuberance swells or pushes out, often in rounded rather than angular form.

A bulge is a protuberance or expansion of a surface caused usually by pressure from within or below.