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"knoll" is also used as a crossword clue. If that's what you saw, the answer is often hillock (7 letters).
Definitions
a small natural hill
Word origin
From Middle English knol, knolle, from Old English cnoll (“summit”), from Proto-Germanic *knudan-, *knudla-, *knulla- (“lump”), possibly related to cnotta.
Used in a sentence
“grassy knoll”
“On knoll or hillock rears his crest, / Lonely and huge, the giant oak.”
“In the northern hemisphere, June 21 has the most daylight hours. Pack a picnic—a chilled bottle of Sancerre, cheese, olives, and a nice baguette—and hit the grassy knoll.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Small rounded hill”5 letters
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