Synonyms of hillock
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hummockA hummock is a small raised area of ground, like a very small hill.
• They carried a single trunk over a tiny hummock of the island.
knollA knoll is a low hill with gentle slopes and a rounded top.
• a grassy knoll
• We sat on a grassy mound and had our picnic.
Thesaurus for hillock from the Collins English Thesaurus