Difference

Thanks in advance

If you are talking in the context of direction I view the difference like this:

A pathway is more specific. It is a path or route that takes you somewhere along a specified path. 

Way is more general. You can say something like: 'The store is that way.' And point a direction but that does not mean there is a specific route to get to the store. It is just the general direction. 

The words can also be used like this:

Way - 'I am on the way.' --> Meaning you are coming 

Way - 'Do not do the homework that way.' --> Meaning do not do the homework in that manner.

Pathway - 'Working hard everyday is the pathway to success.' --> used to show how something led to something else.