warrior

noun3

1. •
   a soldier or any other fighter who faces an enemy in battle

   • [Link:] Gee, it sure is boring around here. [King Harkinian:] My boy, this peace is what all true warriors strive for. — 1993
2. •
   (figurative) A person who is aggressively, courageously, or energetically involved in an activity, such as athletics.
3. •
   (figurative) Anything exceptionally tough, stubborn, or that is hard to conquer or overcome.

   • It was an old warrior of a hole about sixty feet deep, that had broken the hearts of numerous gangs of well-sinkers, all of whom abandoned it[.] — 1911