someone who is in your class at school
classmate
the head of the company and the worker
boss and employee
a person who works with others toward a common goal
partner
people who are in the same team
teammate
teacher and student
mentor and pupil
bride and groom
fiancée and fiancé
someone who promises to help a child, and to teach him or her Christian values
godfather/godmother
a person or country belonging to a group or team
member