I have angels in my story (only two since their people were destroyed in a war right before the beginning). They are not immortal but age or illness don't affect them. They can be killed, although they are harder to kill than a human and better at healing. I have a bit of trouble naming one of them. I looked through angel name lists but I don't want to use something common, and less-known names are usually long and complicated. And they are not Biblical angels.