A ridge or hill of ice in an ice field.
A hillock; mound
The definition of a sack is a bag used for putting things in or a bag that already contains something.
Freedom of action:
A bunk bed.
A pile or heap resembling a bed, esp. in softness or shape
Find another word for hammocks. In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for hammocks, like: hummocks, mounds, knolls, sacks, swings, bunks and bed.