This question went hot on the network today:
Upon visiting it, I found that there are lots of other questions like this.
This one, and the others, suffer from the problem that what is really being asked is "what is a word that means 'a person who...'?"
But the answers are full of words that don't mean that at all, they are simply "names" that could be applied to a person like that.
For example, none of these words, offered as answers, mean "a person who pretends to be your friend but is your enemy":
a'hole d'bag sociopath deceitful con artist traitor disloyal perfidious
So I'm wondering if it is a legitimate edit, to change questions of this nature to "What is a word for a that means a person who... ?"