Edit hmm.. apparently potluck coming from potlatch IS one of the theories for the origin of the word. Nothing conclusive though ( but nothing conclusive for other theorising either, only speculation)
But apparently that was wrong aswell !! Wigwam do exist... and do not look like tipis.. Wth does everybody think that and teach others that then..
Enclosed I would ve gotten and even (closed) "top" but if that is what the termonology is.. (cant find it though, only keep getting stuff on how to transport a kayak on the roof of your car..)