Enter a clue or pattern or both:
The Clue
Obstruction at the entrance to a cave, maybe (7 letter answer)
The Answer
BOULDER
Tags
Notes
The answer BOULDER is so rare that it appears less than once every 2500 puzzles.
Related Clues
Plymouth Rock, e.g.
City near the world's highest dam
Rock that may be hard to roll
Definition
BOULDER as a noun:
1. (boulder, bowlder) = a large smooth mass of rock detached from its place of origin
2. a town in north central Colorado; Rocky Mountains resort center and university town