Can you get a unique password in Minecraft?

I have a question about my Minecraft account. I'm gone for 4 days and my friend has to do something on my acc. However, I don't want to send him my real password. Is there any other way that he can access it

No, and it doesn't make any sense either, as you are not allowed / should not pass on your password or username / email address. He can quickly change the password / email and your Minecraft is gone.

In addition, what should he do in your account that can't wait 5 days… Incomprehensible…