This was such a good question that I looked up on Google, according to Hoarders 911.https://hoarders911.com/what-is-the-difference-of-hoarding-and-collecting " Collectors generally have a designated area to store and display their things. Hoarders, on the other hand, can block off entire rooms of their house with the size of their collection, causing them to be anywhere from unsafe to completely unusable"