害 damage

That GUY punched the master right in the fucking mouth, damaging his crown in the process.

pollution. ★★☆☆☆
公 (public) + 害 (damage) = 公害 (pollution.)

pollution. Has a more broad meaning than the related word 汚染（おせん）。 Not just dirty smoggy air, but also noise pollution, the annoyance of someone talking on a cellphone on a train, and 情報公害　（じょうほうこうがい）: "ad pollution" - the inescapable advertisements one sees everywhere. BOOBOO:If you want to say "environmental pollution," you have to use 汚染、　not 公害。

casualties ★★☆☆☆
被 (get injured) + 害 (damage) = 被害 (casualties)

damage (to property) or casualties (human): used about earthquakes, wars, and crimes.

victim ★★☆☆☆ NP
被害 (casualties) + 者 (professional) = 被害者 (victim)

interference ★★☆☆☆
妨 (prevent) + 害 (damage) = 妨害 (interference)

interference - a person interferes with you. (妨害 is used with people, while the related term 阻害（そがい） is used about objects）