knoll

Short definition from Wiktionary

Noun

1. 1
   A small mound or rounded hill.
2. 2
   A rounded, underwater hill with a prominence of less than 1,000 metres, which does not breach the water's surface.
3. 3
   A knell.

Verb

1. 1
   To ring (a bell) mournfully; to knell.
2. 2
   To sound (something) like a bell; to knell.
3. 3
   To call (someone, to church) by sounding or making a knell (as a bell, a trumpet, etc).
4. 4
   To arrange related objects in parallel or at 90 degree angles.

Proper noun

1. 1
   A surname from German