Hello! I just learned a new term called a "proprietary eponym." It's a brand name that is so synonymous with a generic item that it basically becomes the defining word for that product.
For example, nearly everyone calls "hook and loop fasteners" Velcro, even if the fasteners aren't the Velcro brand.
And I can't think of someone asking me to go play "novelty flying disc" in the park. Instead, they'd probably just say Frisbee, even though that's a brand name.