The ancient Greek term for the older male partner in a pederastic relationship was the erastes (ἐραστής), which translates to "lover".
Role: The erastes was typically an adult citizen over the age of twenty who acted as a mentor, protector, and educator for the younger partner.
Counterpart: The younger adolescent male partner (usually in his teens) was called the eromenos (ἐρώμενος), meaning the "beloved"
pais does not mean "servant." It means "lover."