梟する[kyousuru] to expose (a severed head)
梟悪[kyouaku] great treachery
梟罪[kyouzai] crime of exposing a severed head
梟首[kyoushu] exposure of a severed head
梟将[kyoushou] brave general

梟敵[kyouteki] treacherous enemy
梟雄[kyouyuu] ringleader
梟猛[kyoumou] fierce
樺太梟[karafutofukurou] great grey owl (Strix nebulosa)

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