War
noun, verbal noun
You have war and conflict. Of course, conflict comes with war, so this word just means war.
せんそう
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.
戦争に行くのは半年ぶりです。
This is the first time I've gone to war in six months.
戦争のない時代に生まれたかったなあ。
I wish I were born in an era where there is no war.
戦争で失った事もたくさんあるけど、戦争から学んだ事もたくさんある。
There are many things that we lost in the war, but we also have learned a lot from the war.