冠: crown; a kind of cap; title; radical at the top of a kanji

観測者: observer (one who observes)

ブラウン管: cathode ray tube

慣用句: idiom

監獄: prison

(university slang) Short for 立て看板 (tate-kanban).

television (etc.) program whose name includes the name of a person, company, product, etc.

缶切り: can opener

amberjack (fishes of genus Seriola)

乾布摩擦: The activity of rubbing your body with a dry cloth, thought to strengthen or warm up your skin, and therefore to prevent from winter illnesses, such as cold.