There are 7 two letter combinations in Polish language. Each of them corresponds a single sound. Letters ch = h and rz = ż are pronunced exactly the same way.
CH CZ RZ SZ DZ DŻ DŹ

More words to practice your pronunciation:
Ch – choinka (Christmas tree), chleb (bread)
Cz – czołg (tank), czoło (forehead)
Rz – rzecz (thing), drzewo (tree)
Sz – szalik (scarf), szczotka (brush)
Dz – dzwonek (bell), dzban (jug)
Dż – dżdżownica (earthworm), dżungla (jungle)
Dź – dźwięk (sound), niedźwiedź (bear)

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