How many letters does the top answer for “a large smooth mass of rock detached from its place of origin” have?

The most common answer is boulder (7 letters).

Crossword clue: a large smooth mass of rock detached from its place of origin

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

boulder 7 letters wn-def

a large smooth mass of rock detached from its place of origin

bowlder 7 letters wn-def

a large smooth mass of rock detached from its place of origin