twelve
The letters spell listlessness. The word uses all 12 letters.
You can't spell any 13 letter words from just 12 letters. You need the final S to spell "procrastinate."
the answer to level is 12 but you have to spell it in letters.
Those letters spell natural.
The letters in "these letters" can spell the phrase "ether settles." The letters can spell shorter words such as trestles, sheerest, shelters, and treeless.
Type the letters to pop the balloons, but not the K, E, and Y.You leave the letters that spell key.
Those letters will spell dollar.
The letters spell 'broccoli'.
Those letters spell psycho.
Those letters will spell carnivore.
The letters can spell the anagram "annotation."
Those letters will spell democratic.