How many letters does the top answer for “a small hill. shak.” have?

The most common answer is hillock (7 letters).

Crossword clue: a small hill. shak.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

hillock 7 letters web-def

a small natural hill

a mound or small hill. 50% similar → dun

a small herb. shak. 50% similar → herblet

a small natural hill 50% similar → hillock, hummock, knoll