It only uses four different letters. It uses a total of 7 letters because the A is used 4 times. So 4 different letters and the A used 3 more times than that.
What word uses letters alosetkfcctw
people
MATZOHS uses those letters.
Computer uses all the letters.
Algebra uses letters called variables
Those letters spell "usher".
Photon uses all the letters
Those letters spell deacon.
The letters spell scribal. The word uses all 7 letters.
The letters spell a choosy. The word uses all 6 letters.
The letters spell cajolement. The word uses all ten letters.