A simple way to distinguish between the two is to use type when referring to classifying or grouping something, while using form when talking about the structure and make of something.

Pasta is a popular food from Italy. It is made from a dough of grain floor. Many different types of dishes can be prepared by the pastas using different ingredients. They are usually differentiated on the...

Clouds are generally classified into three types – High, Low and Middle types, depending upon their region of formation. They are further classified according to their shape and size.