Enter a clue or pattern or both:
The Clue
Good for a scientist, bad for a roofer (12 letter answer)
The Answer
BREAKTHROUGH
Tags
Notes
The answer BREAKTHROUGH is so rare that it appears less than once every 2500 puzzles.
Definition
BREAKTHROUGH as a noun:
1. (discovery, breakthrough, find) = a productive insight
2. making an important discovery
3. a penetration of a barrier such as an enemy's defense