Okay, I’m cheating a bit, since I already know about one true homonym in Esperanto: radio (meaning radio or ray). Do any others exist?
I’m looking for single word roots with divergent meanings, so no puns like kol-ego ⁓ kolego.
Sendube estas multaj. Jen listo el Vikipedio.
Mi scias ke mi vidis pli en PIV kiuj ne estas en la vikipedia listo.
There are a few:
There are probably a couple more, but I cannot think of any others. I will edit this answer if I find any incidentally.