Arabic version

I'm working to extended my font to new alphabets, as arab, now is available, in latin, cyrillic.
But the arab is becoming one of the hardest steps of my work. Unlike the latin now I having problems to evaluate the space between the letters and the high of some of the glyphs.

I do not know the Arabic language, nor Russian.

Below are a few words written in Arabic, can you tell me if they are spelled correctly?

Thank you