INNERCORE
Set to 2 different clues across 2 published puzzles, most often “The earth's is largely iron” — The New York Times, Friday, 25 February 2000.
9 letters
Every clue on record, most used first
- The earth's is largely irononce
The New York Times — Friday, 25 February 2000
- Planet's centeronce
The New York Times — Saturday, 6 July 1996