Confinement
Imprisonment
noun, verbal noun
ゆうへい
入所 (にゅうしょ) Admission, Entrance, Imprisonment, Internment
入獄 (にゅうごく) Imprisonment
幽閉 (ゆうへい) Confinement, Imprisonment
拘置 (こうち) Detention, Confinement
It's just you ゆう and hay へい in solitary Confinement.