letter
noun
a written message addressed to a person or organization
“mailed an indignant letter to the editor”
Synonymsmissivethe conventional characters of the alphabet used to represent speech
“his grandmother taught him his letters”
owner who lets another person use something (housing usually) for hire
a strictly literal interpretation (as distinct from the intention)
“he followed instructions to the letter”
“he obeyed the letter of the law”
an award earned by participation in a school sport
“he won letters in three sports”
Synonymsvarsity letter
verb
win an athletic letter
set down or print with letters
mark letters on or mark with letters
Source: WordNet 3.1, Princeton University