POSTERBOARD

\pˈə͡ʊstəbˌɔːd], \pˈə‍ʊstəbˌɔːd], \p_ˈəʊ_s_t_ə_b_ˌɔː_d]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd