Here are examples of the word/phrase "fighters" used in a sentence and paraphrased in a sentence...
Strong fighters are strong because they train often.
Strong warriors are strong because they train often.
A lot of fighters are in attendance to compete with eachother.
A plethora of combatants are in attendance to compete with eachother.
Fighters who enjoy combat are usually difficult to conquer.
Warriors who love combat are usually hard to surmount.
Other Examples...