make fun of (inseparable): make jokes about (usually unkindly).
"I agree that Bob looks ridiculous since he shaved his head, but don't
make fun of him. You'll hurt his feelings."
make up (1. separable): invent / create (imaginary) information.
"Judy's story is hard to believe. I'm sure she made it up."
make up (2. separable): compensate for something missed or not done by doing
extra or equivalent work.
"I'm sorry I missed the test. May I make it up?"
make up (with) (3. inseparabl