noun

• A person who fights; a combatant.
• A warrior; a fighting soldier.
• A pugnacious, competitive person.
• (eulogistic) A person with a strong determination to resist protracted or severe adversity, especially illness.
• A class of fixed-wing aircraft whose primary purpose is to shoot down other aircraft, sometimes accompanied by a secondary purpose of attacking ground targets.
• (science fiction, by extension) A starfighter
• A participant in boxing or any martial art.
• (colloquial) A firefighter.
• (video games) A game with a focus on physical combat.