Synonyms for Shammer (same or very similar meaning)
WordNet sense 1 (someone shirking their duty by feigning illness or incapacity):
malingerer, skulkerWordNet sense 2 (a person who makes deceitful pretenses):
fake, faker, fraud, imposter, impostor, pretender, pseudo, sham, pseud, role playerFrom the ODE community, based on WordNetadd/edit