I am going to be a bit anal and picky here. I want to clear up a common misconception about reels and spools.
The above terms can be interchangeable. However strictly speaking the "reels" are the actual film itself wound on to a cylindrical
device ie: a film bobbin.
Spools are those things that hold the reels of film for projection purposes.
So a 6 Reel film will be mounted on 6 Spools.
Notta a lotta people know that. hahaha !