knoll / noll [noʊl]
knoll – n. – 1a. the summit or rounded top of a mountain or hill; b. Nautical the head of a bank, or the most elevated part of a submarine shoal; 2. a small hill or eminence of more or less rounded form; a hillock, a mound. 3. a lump, a large piece
noll – n. – 1. top of the head or the head itself; 2. an extreme point, a pole