DOIS

Set to 3 different clues across 4 published puzzles, most often “Two, in Lisbon” — The New York Times, Sunday, 22 April 2007.

4 letters

Every clue on record, most used first

Two, in Lisbon2 times
The New York Times — Sunday, 22 April 2007
The Everly Brothers' "All I Have to ___ Dream"once
The New York Times — Tuesday, 9 June 2009
Two, in Brazilonce
The New York Times — Friday, 20 October 2006