"Who is the professional?"
Translation:Ποιος είναι ο επαγγελματίας;
Are Ποιο and Ποιος the different forms of the same word? Or are they different words all together?
Ποιο is the neutrum gender form, ποιος is the masculine gender form of the same word.
What is the feminine form? Among a group of ladies, one may ask: "Who is the supervisor?"