2anta 2staadh 2urduniyy yaa bashiir.
Mu3allim and 2staadh are the same but i was considered wrong by using mu3allim
As far as I could understand Mu3allim is a teacher from the first year one goes to school upto the high school. 2staadh is a Professor at the university.
I know right, duolingo seem very dramatic