bantamweight - an amateur boxer who weighs no more than 119 pounds

slugger, slogger - a boxer noted for an ability to deliver hard punches

battler, belligerent, combatant, fighter, scrapper - someone who fights (or is fighting)

featherweight - an amateur boxer who weighs no more than 126 pounds

flyweight - an amateur boxer who weighs no more than 112 pounds

heavyweight - an amateur boxer who weighs no more than 201 pounds

junior featherweight - weighs no more than 122 pounds

junior lightweight - weighs no more than 130 pounds

junior middleweight - weighs no more than 154 pounds

junior welterweight - weighs no more than 140 pounds

light flyweight - an amateur boxer who weighs no more than 106 pounds

light heavyweight - an amateur boxer who weighs no more than 179 pounds

light middleweight - an amateur boxer who weighs no more than 156 pounds

lightweight - an amateur boxer who weighs no more than 132 pounds

light welterweight - an amateur boxer who weighs no more than 140 pounds

middleweight - an amateur boxer who weighs no more than 165 pounds

prizefighter, gladiator - a professional boxer

puncher - someone who delivers punches

sparring mate, sparring partner - a boxer who spars with another boxer who is training for an important fight

palooka, stumblebum - a second-rate prize fighter

super heavyweight - an amateur boxer who weighs more than 201 pounds

welterweight - an amateur boxer who weighs no more than 148 pounds