battle, combat, fight (mutual use of force or weapons against one another)
fight; clash (arrange combat often for entertainment; arranged sports competition)
fight, combat (act of attempting to defeat an opponent in some dispute or contest)
struggle, fight (act of attempting to remove undesirable phenomena or difficulties, to get something, or to help someone)
struggle, fight (act of attempting to win someone's favor)
struggle, fight (act of opposing forces of nature or general phenomena)
clash (contradiction, e.g. between differing or contending interests, views, purposes)
(obsolete) competition (fighting for resources between species in the same environment)
(obsolete) desire, want for something