Does Aamir necessarily have to come first? Can it be नेहा का पड़ोसी आमीर है?
That would say, "Neha's neighbor is Aamir." Is there a difference? You decide.
Why is का पड़ोसी used? Isn't पड़ोसी feminine?
The का here is used for आमिर
पड़ोसी is masculine. Although it ends with an "i".
That is why "ka" is used.