I have created a web application that has two offerings, one is free, the other is paid. The paid version has exactly the same functionality as the free version, it's just that it can be used with more people.
I am struggling with what to call the paid account.
Here are some I have rejected.
"pro" or "professional" - Implies that if you use the free version, your not professional.
"premium" - Sounds expensive.
"gold, silver, bronze" - doesn't really work with two offerings, and implies class.
"restricted/full" - Implies less/more functionality.