Territory war/battle

No. 

Nope.  Get yourself into a guild that has discord and uses hotutils.  It'll give you a list of what omicrons / zetas to do and what they're for so you don't mix 'em up.

No, I don’t get the words “war” & “battle” mixed up

How about the definition 

No, because even at a glance War is shorter than battle.

Yeah, with something as hard to get as omicrons, you'd think people would be more careful about making sure they got the right ability. There is something called reading after all. Some people can spend hours reading an actual novel, meanwhile the OP can't be bothered to take a few seconds to see if the omicron is for Territory Battles or Territory Wars.

I don’t think there’s any need to be condescending - for all we know this player might use another language where the difference between war and battle might be much more subtle than it is in English. 

Yeah, I guess I was a little rude. Still, if it's English, my point stands - war and battle are spelled differently, they're pronounced differently, they're used for two completely different events. If he uses a different language, there's still not much excuse - the two events have been out more than long enough that even if the words war and battle are the absolute same in that language he still could have asked a guildmate, someone on Discord, looked it up on YouTube, etc., just to make sure.

Doesn’t matter 

I completely agree! Clearly, Territory War should be renamed "Happy Fun Slumber Party," and Territory Battle should be changed to "Sunny Garden Tea Party." Nobody in their right mind would confuse the two.

I'm also 100% for renaming all characters "Steve." Yes, ALL of them.