Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun boulder

2 senses of boulder

Sense 1
boulder, bowlder -- (a large smooth mass of rock detached from its place of origin)
       => rock, stone -- (a lump or mass of hard consolidated mineral matter; "he threw a rock at me")

Sense 2
Boulder -- (a town in north central Colorado; Rocky Mountains resort center and university town)
       INSTANCE OF=> town -- (an urban area with a fixed boundary that is smaller than a city; "they drive through town on their way to work")