You can make 33 words from letter according to the Scrabble US and Canada dictionary.
Definitions and meaning of letter
letter
Pronunciation
(Received Pronunciation) IPA(key): /ˈlɛtə/
(General American) IPA(key): /ˈlɛtɚ/, [-ɾɚ]
(General Australian) IPA(key): /ˈletə/, [-ɾə(ɹ)]
Rhymes: -ɛtə(ɹ)
Hyphenation: let‧ter
Etymology 1
From Middle Englishletter, lettre, from Old Frenchletre, from Latinlittera(“letter of the alphabet"; in plural, "epistle”), from Etruscan, from Ancient Greekδιφθέρᾱ(diphthérā, “tablet”). Related to diphtheria. Displaced Old Englishbōcstæf(literally “book staff”) in sense 1 and ǣrendġewrit(literally “message writing”) in sense 2.
Alternative forms
lettre(obsolete)
Noun
letter (pluralletters)
A symbol in an alphabet.
A written or printed communication, generally longer and more formal than a note.
The literal meaning of something, as distinguished from its intended and remoter meaning (the spirit).
(in the plural) Literature.
(law) A division unit of a piece of law marked by a letter of the alphabet.
Letter (b) constitutes an exception to this provision.
(US, uncountable) A size of paper, 8½ in × 11 in (215.9 mm × 279.4 mm).
(Canada, uncountable) A size of paper, 215 mm × 280 mm.
(US, scholastic)Clipping of varsity letter.
(printing, dated) A single type; type, collectively; a style of type.