can I get the greyhound buss there?

I'm not sure, but the Greyhound website may be a better source of information.

No, not to my knowledge- There is a greyhound station downtown and the blue line cta train will take you all the way to the airport

I didnt see any buses but you can call and ask

Do don't believe so but you can call a airline at the airport and maybe the can answer your question ❓ I didn't see a grey hound station there but I'm sure it a location downtown chicago