letterbox is a valid English word

Scrabble validity: valid ( international - Sowpods, US - Twl06 )
iScramble validity: valid
QuickWords validity: valid

Meanings

Noun (COUNTABLE)

(chiefly UK) A box into which mail is put.
• Synonym: mailbox
A hidden container that holds a logbook and rubber stamp, found by following clues as a form of recreation.
(mountaineering) A rectangular hole or slot.

Adjective (NOT COMPARABLE)

(film) Transferred to home video formats while preserving the original aspect ratio, having black bars above and below the picture area.

Verb

(film) To transfer a widescreen motion picture to home video formats while preserving the original aspect ratio, with the placing of black bars above and below the picture area.
To hunt for letterboxes (containers with logbook and rubber stamp) by following clues.

letterbox is a Scrabble valid word

letterbox

• International English (Sowpods) - The word is valid in Scrabble ✔
• US English (TWL06) - The word is valid in Scrabble ✔
• 00 points

letterbox is an iScramble, QuickWords valid word

letterbox

• The word is valid in iScramble ✔
• The word is valid in QuickWords ✔
• 00 points

Same letters words (Anagrams)

• none

Same letters plus one

• EXTORTABLE

Same letters minus one

• REBOTTLE