However, depending on the context, you could use several alternatives:
For a male tutor:
* Tutor
* Preceptor
* Instructor
* Mentor
* Governor (although this is typically used for someone with political power)
For a male guardian:
* Guardian
* Ward
* Protector
* Caretaker
The best option would depend on the specific situation and the nuances of the role you're trying to describe.