Adding some other world-wide known Japanese words:
芸者 geisha
合気道 aikido
盆栽 bonsai
万歳 banzai!
乾杯 kanpai!
切腹 seppuku (for westerners more commonly known as harakiri)
Nagoyankee-san: Forrest Gump is my favourite movie and I came across this quotation when I was writting a 'sakubun' as a homework
