fewest

The word fewest uses 6 letters:eefstw.

FEWEST is playable in:

Words With Friends12
Scrabble US12
Scrabble UK12

fewest is a valid word in this word list. For a definition, see the external dictionary links below.

Try a search for fewest in these online resources (some words may not be found):
Wiktionary - OneLook Dictionaries - Merriam-Webster - Google Search
Each search will normally open in a new window.