指代範圍不同。war、warfare壹般都譯為“戰爭”，但warfare多是指某種戰術或戰爭。warfare是不可數名詞，war可數或不可數名詞都可以，所以“壹場戰爭”不可能說a warfare，只能說a war。
warfare的例句
In the history of coalitionwarfaresuch impasses have been common, and sometimes disastrous.
在聯合作戰的歷史中，這種相持不下的局面是很普通的，往往也是災難性的。
This does not mean the abandonment of vital strategic points, which can be defended in positional warfare AS long AS profitable.
這並不是說要放棄戰略要沖，只要認為有利，戰略要沖還是應該用陣地戰來保衛的。
By the late 4th century BC, armed deck soldiers had become so important in naval warfare that it was superseded by heavier ships.
在公元前4世紀末期，裝甲兵在海戰中很重要，因此該船被更重的船取代。
war的例句The hope of a short war went glimmering.
戰爭無望在短期內結束。
A series of provocations led up to the border war.
壹系列的挑釁事件導致了邊境戰爭的發生。
The army was disbanded when the war came to an end.
戰爭結束時，軍隊即被解散。