posterboard is a valid English word

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

Meanings

Noun (COUNTABLE AND UNCOUNTABLE)

(uncountable) Cardboard material suitable for making posters.
• I used a piece of posterboard for my project.
A piece of such material.
• I used the posterboard for my project.
(direct marketing) A flyer printed on stiff cardboard, approximately 8.5 by 11 inches, mailed flat.
• They sent me a nice posterboard on the new product.

posterboard is not a Scrabble valid word

posterboard

• International English (Sowpods) - The word is not valid in Scrabble ✘
• US English (TWL06) - The word is not valid in Scrabble ✘
• 00 points

posterboard is not an iScramble, QuickWords valid word

posterboard

• The word is not valid in iScramble ✘
• The word is not valid in QuickWords ✘
• 00 points

Same letters words (Anagrams)

• none

Same letters plus one

• POSTERBOARDS

Same letters minus one

• BAROTROPES
• BOARDSPORT
• BORDERPOST
• BREADROOTS