What is the difference between Mistral and Foehn?

The Mistral is the name given to the strong, northerly or north-westerly wind experienced on the shores of the north-west Mediterranean. It is most prevalent during the winter. The wind is strong and may sometimes have a speed of over 100 km per hour. It is also very cold and harmful to plant life.

Fig. Mistral
The Foehn is the name given to the hot dry wind which blows down the leeward slopes of mountains.
Foehn winds often blow with great velocity and cause much discomfort. They cause snow to disappear very quickly and thus make pasture available for animals sooner than would otherwise be the case. Similar winds blowing eastwards across the Prairies of North America from the Rockies are known as Chinook Winds.