Battle, fight (4)
I believe the answer is:
fray
I believe this is a double definition.
'battle' is the first definition.
(I know that fray is a type of combat)
'fight' is the second definition.
(I know that fray is a type of fight)
(Other definitions for fray that I've seen before include "Wear away at the edges" , "Come apart at the edges" , "Tempers may do" , "Noisy fight" , "Wear away from rubbing" .)