Common Words:
* Employee
* Referee
* Trustee
* Trainee
* Fiancée (female)
* Fiancé (male)
* Mortgagee
* Lessee
* Debtor (sometimes used as a synonym for "debtor")
Less Common Words:
* Aimee (a given name)
* Cherokee (a Native American tribe)
* Cigarette
* Committee
* Coffee
* Doree (a given name)
* Free
* Guarantee
* Guarantee
* Lee (a given name)
* Mentee
* Monkee (a member of the band "The Monkees")
* Patee (a type of pastry)
* Skee (a type of skiing)
* Toree (a given name)
* Vee (a given name)
Words with "-ee" in the middle:
* Believe
* Complete
* Free
* Sleeve
* Street
This is not an exhaustive list, but it provides a good starting point.
Note: The "-ee" suffix often indicates the recipient of an action or the person who is subject to something. For example, an employee is someone who is employed, a trainee is someone who is being trained, and a referee is someone who is refereeing a game.