noun, する verb
You have war and conflict. Of course, conflict comes with war, so this word just means war.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
This is the first time I've gone to war in six months.
Can you list up to ten reasons why we shouldn't go to war?
I want to get a six pack before the war begins.