Warfare is the activity of fighting a war. Modern warfare, trench warfare, chemical warfare.
It takes a modifier and names a kind of fighting: guerrilla warfare, siege warfare, economic warfare. The laws of war regulate it and are broken constantly, which is not the same as their being useless. The fare in it means going, as in seafare and thoroughfare.
1nounwarfareThe activity of fighting a war.
“The museum shows how warfare changed after the invention of the tank.”
warfare is a fighting.
War plus fare, from an old sense of fare meaning a going or journey. Thoroughfare keeps the same word.
Middle English
werre-faringe
English, today
warfare
Built from
From war + fare; perhaps a shortening of Middle English werre-faringe, werfarynge (“waging war, warfare”) literally “going to war”.
Etymology from Wiktionary, CC BY-SA