Ninja
noun
An endure someone is someone who can endure. Who endures everything better than anyone? A ninja.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Watch out for the rendaku.
コウイチは忍者に、正々堂々と勝負で勝った。
Koichi beat the ninja fair and square!