Samurai
noun
A military samurai is a samurai. This is how most people say "samurai" in Japanese.
ぶし
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
コウイチは武士のようにストイックに走り続け、フルマラソンを完走した。
Koichi kept running as stoically as a samurai and finished the full marathon.