poster board poster • poster boy · · · Info · Definitions · Synonyms · Characters · · poster board · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) a cardboard suitable for making posters. Synonyms: paperboard, poster board, posterboard. · · Noun Definition 1 Synonyms · · · paperboard · · Synonym 1 posterboard · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 d latin small letter d U+0064 e latin small letter e U+0065 o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074