If one searches in the OSM wiki for "pavillon", you are being asked: do you mean "pavilion"?
If one searches in the OSM wiki for "pavillion", you are being asked: do you mean "pavilion"?
If (and it might be true) that there is an other type of building, named "pavillon (tagged first in 2017, and it is indeed in my German dictionary) then there should have been a wiki describing it, and that wiki should also point out the differences between a "pavillon" and a "pavilion".
If I understand flohoff well, then this is correct:
https://www.openstreetmap.org/changeset/159783974 (because I changed pavillion to pavilion)
but this one is not correct:
https://www.openstreetmap.org/way/483419854 (because I changed pavillon to pavilion )

Worldwide I found 48 occurences of pavillion.
Worldwide I found 47 occurences of pavillon.
(And worldwide I found 14491 occurences of pavilion).

I did not change all of the pavillion/pavillon occurences to pavilion because I didn't have the time, as I visit all those (in my opinion typos) one by one to check what I change, and if it has the tag building=pavillon/pavillion I changed it to building=pavilion for reasons I have explained already.

If there should be a valid building=pavilion AND a valid building=pavillon in the wiki (and on OSM), then we are 7 years late.

I shall follow the discussion (started by flohoff) on the forum.

Marc.