Fighter

noun

1. A person who fights; a combatant.
2. A warrior; fighting soldier.
3. A pugnacious, competitive person.
4. (eulogistic) A person with a strong determination to resist protracted or severe adversity, especially illness.
5. A class of fixed-wing aircraft whose primary purpose is that of shooting down other aircraft. Some of these (Fighter-Attack or Attack aircraft) also have a secondary purpose of attacking ground targets.