手枷[tegase] handcuffs
足枷[ashikase] fetters
首枷[kubikase] pillory
連枷[karazao] flail (for threshing grain)

手枷足枷[tekaseashikase] manacles
口枷[kuchikase] (mouth) gag
枷蚯蚓[kasemimizu] Epimenia verrucosa (mollusc)
子は三界の首枷[kohasangainokubikase] A child is an everlasting responsibility to parents

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