Kh

(Alphabet lesson 5)

There are 2 letters that are pronounced 'kh' in Pashto.  Remember that 'kh' is like a strong Spanish 'j' or like the German 'ch'.  Those letters are خ and ښ (in the eastern dialect)

There's a difference, though. 
خ is stronger, formed in the throat.  It's the sound made when you have mucus in your throat and are trying to spit it out
ښ is softer, formed mid-mouth.  It can sometimes be confused with an 'h'