1.  warpath(n = noun.feeling) - hostile or belligerent mood; "the chief is on the warpath today"
is a kind of belligerence, belligerency

2.  warpath(n = noun.act) - a course leading to warfare or battle;
is a kind of path, way, way of life

   The route taken by a party of Indians going on a warlike expedition. Schoolcraft. [1913 Webster]

warpath, n.
1 a warlike expedition of N. American Indians.
2 colloq. any hostile course or attitude (is on the warpath again).

N  warfare, fighting, hostilities, war, arms, the sword, Mars, Bellona, grim visaged war, horrida bella, bloodshed, appeal to arms, appeal to the sword, ordeal of battle, wager of battle, ultima ratio regum, arbitrament of the sword, battle array, campaign, crusade, expedition, operations, mobilization, state of siege, battlefield, theater of operations, warpath, art of war, tactics, strategy, castrametation, generalship, soldiership, logistics, military evolutions, ballistics, gunnery, chivalry, gunpowder, shot, battle, tug of war, service, campaigning, active service, tented field, kriegspiel, Kriegsspiel, fire cross, trumpet, clarion, bugle, pibroch, slogan, war-cry, war-whoop, battle cry, beat of drum, rappel, tom-tom, calumet of war, word of command, password, watchword, passage d-armes, war to the death, war to the knife, guerre a mort, guerre a outrance, open war, internecine war, civil war, contending, contentious, armed, armed to the teeth, armed cap-a-pie, sword in hand, in arms, under arms, up in arms, at war with, bristling with arms, in battle array, in open arms, in the field, embattled, battled, unpacific, unpeaceful, belligerent, combative, armigerous, bellicose, martial, warlike, military, militant, soldier-like, soldierly, chivalrous, strategical, internecine, flagrante bello, in the thick of the fray, in the cannon's mouth, at the sword's point, at the point of the bayonet, Int, vae victis!, to arms!, to your tents O Israel!, the battle rages, a la guerre comme a la guerre, bis peccare in bello non licet, jus gladii, my voice is still for war, 'tis well that war is so terrible, otherwise we might grow fond of it, my sentence is for open war, pride, pomp, and circumstance of glorious war, the cannons have their bowels full of wrath, the cannons aspit forth their iron indignation, the fire-eyed maid of smoky war, silent leges inter arma, si vis pacem para bellum.