偽金[nisegane] counterfeit money
偽首[nisekubi] falsified severed head
偽り[itsuwari] lie
偽り語る[itsuwarikataru] to speak falsely
偽り者[itsuwarimono] impostor

偽り誓う[itsuwarichikau] to swear falsely
偽る[itsuwaru] to lie
偽悪[giaku] pretense of evil
偽印[giin] forged seal

一首[isshu] tanka
鎌首[kamakubi] sickle-shaped neck (e.g. snake, praying mantis)
丸首[marukubi] round-necked (T-shirt)
偽首[nisekubi] falsified severed head
カリ首[karikubi] (something resembling a) goose's neck

がん首[gankubi] head of a pipe, incl. the bowl and stem attachment
機首[kishu] nose (of plane)
襟首[erikubi] nape of neck
元首[genshu] ruler
絞首刑[koushukei] death by hanging