Alienism is a word or phrase that relates to the status of being alien (yawn).

I like this person’s thinking on alienism better:

I like Alienism, but such word is really complicated. In fact, no one has seen an alien, not even a picture of that. So, how could one say “alienism”, whereinfact, no data has been gathered yet. It’s funny to say there’s an alienism on earth. So, who are the aliens then?