BOTS

Set to 2 different clues across 2 published puzzles, most often “Droids” — The New York Times, Tuesday, 19 January 2010.

4 letters

Every clue on record, most used first

Droidsonce
The New York Times — Tuesday, 19 January 2010
Nonhuman co-hosts of TV's "Mystery Science Theater 3000"once
The New York Times — Sunday, 27 May 2007