贋印[nisein] forged seal
贋金[nisegane] counterfeit money
贋作[gansaku] fake
贋手紙[nisetegami] forged letter
贋首[nisekubi] falsified severed head

贋造[ganzou] counterfeiting
贋造紙幣[ganzoushihei] counterfeit paper money
贋者[nisemono] imposter
贋い[magai] imitation