The "doktor" and "orvos" is the same.
Doktor is usually used when invocating the doctor (Doktor úr), otherwise orvos is used more frequently and sounds more natural
Excuse me, I didn't realise you were Hungarian :)
Why doesn't this word order work: "Hol az órvős sétál?"
Because that litteraly means 'where the doctor walking'? Doesn't sound, does it?
The question word (hol) should be directly before the verb (sétál).