Role and roll sound alike, but they mean very different things.
Role is a noun that means a part, duty, or function. It is often used for jobs, responsibilities, and acting. For example, She has a key role in the project. You could also say, He played the role of Hamlet.
Roll is usually a verb that means to move by turning over and over. It can also be a noun for something rounded or wrapped, such as a bread roll or a roll of paper. For example, Please roll the dough evenly. Another example is, The ball began to roll down the hill.
A simple way to remember the difference is this:
- Role: part, job, function
- Roll: turning movement, or a rounded item
If you are talking about responsibility or purpose, use role. If you are talking about movement or a cylindrical object, use roll.