五寸釘[gosunkugi] long nail
間釘[aikugi] double-pointed nail
出る釘は打たれる[derukugihautareru] the nail which sticks out gets hammered down (used to encourage conformity)
切り釘[kirikugi] brad
裏釘[urakugi] nail sticking through

装釘[soutei] binding (book)
釘抜き[kuginuki] pincers
金釘流[kanakugiryuu] a scrawl
ねじ釘[nejikugi] screw

隠しカメラ[kakushikamera] hidden camera
隠し引き出し[kakushihikidashi] secret withdrawal
隠し芸[kakushigei] hidden talent
隠し撮り[kakushidori] taking pictures secretly
隠し子[kakushigo] illegitimate child

隠し事[kakushigoto] secret
隠し場所[kakushibasho] cache
隠し食い[kakushigui] eating on the sly
隠し立て[kakushidate] secrecy
隠くす[kakusu] to hide