Forstmann rhymes with:
horstman, horstmann, horstman, horstmann, axtman, chestman, chrestman, christman, christmann, dustman, eastman, gerstman, horstman, horstmann, justman, ostman, postman, westman
Forstmann sounds like:
fabrication, feuerstein, fierstein, firestine, firestone, forgotten, fraction, freestone, freston, friction, frighten, fruchtman