The tag alias #76746 letters -> letter has been approved.
Reason: Plural to singular.
Not meant to be confused with according to the wiki page:
alphabet - Letters listed in order.
letter_(alphabet) - If for some reason a specific letter is important to the image, use this tag instead.
letter_creature
EDIT: The tag alias letters -> letter (forum #451218) has been approved by @spe.
Updated by auto moderator