Thesaurus

(n) : a conflict involving the organized use of arms and physical force between countries or other large-scale armed groups. The warring parties hold territory, which they can win or lose; and each has a leading person or organization which can surrender, or collapse, thus ending the war; a campaign against something. E.g., the war on drugs is a campaign against the use of narcotic drugs; the war on terror is a campaign against terrorist crime

(v) : to engage in conflict with a foe