bulge vs knop

bulge

• Something sticking out from a surface; a swelling, protuberant part; a bending outward, especially when caused by pressure. 

• The outline of male genitals visible through clothing. 

• A sudden rise in value or quantity. 

• The bilge of a vessel. 

• The bilge or protuberant part of a cask. 

• To bilge, as a ship; to founder. 

• To stick out from (a surface). 

knop

• A knob, usually ornamental