おぼ, しず, ない
If you figure out how to use a tsunami as a weapon, everyone is going to die. You can't control a tsunami, you fool. Now you've doomed us all.
The only way to maybe not die is to find boats (ぼつ). As long as the boats don't get smashed by the tsunami, you might be able to cheat death by holding onto the boats and not drowning.
Currently there are no similar looking kanji which exist in the WaniKani learning system