Old Word Repurposed: Warrior

Warrior is an ambiguous term to most people.
But then so is adult. People become adults by trudging through time one second at a time, and accumulate additional privileges through no achievement or effort in most cases (earning a driver's license and graduating high school are the most arduous things that people must do to acquire the traditional trappings of adulthood).
You can become an adult in the modern world so easily that term is meaningless. Warrior is something that you become by doing something. Like being an athlete or a writer or a scientist or a scholar; being a warrior implies a doing in the word itself. If you claim to be an athlete, but look like Homer Simpson people will rightly question your claim. But to claim to be an adult, one need merely get older and have a piece of ID if you wish to enter a bar.
We use Warrior not to mean one who is violent, but one who is ready to face the world: capable of critical thought, able to be self-sufficient, and able to defend their self against opposing forces.