Matter

こと

koto

(reason for concern)

事

koto

(situation, condition, subject or affair)

事件

jiken

(reason for concern)

問題

mondai

(reason for concern)

物質

busshitsu

(basic structural component of the universe)

物質

busshitsu

(non-antimatter matter)

物質

busshitsu

(kind of substance)

重要である

jūyō de aru

(to be important)