I filled out the survey, but the big ones for me waaay back in the beginning were (with reasons):
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Actor: An actor is a person in real life
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Pawn: I thought had something to do with AI since there was a Character class as well (+ above mentioned actor)
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PlayerController: I can create all input actions in my character class, when/why do I need ?
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Cascade / Persona / PHAT
None of the above names are actually used in the editor. In a tutorial I was following it said to open Cascade, which is nowhere to be found in the editor.
Once I read the documentation a bit more it was easy to understand, but at first glance these terms tripped me up a bit. 