What is the difference between a musket and a muzzle loader?

not sure if this is what you are looking for but a musket is usually smooth bored meaning it has no rifling in the barrel where a muzzle loader can have rifling. A muzzle loader refers to any weapon that is loaded thru the muzzle in a simple definition and it can be either smooth bored like a musket or rifled like a Pennsylvania long rifle or like most modern muzzle loaders are today