What is the difference between project and process? Do projects substitute processes?

In contemporary business language, a project consists of a temporary endeavour undertaken to create a unique product, service or result. The key difference between project and process lies in word “temporary”. A project is usually a one time undertaking. Whenever the pattern of activities is repetitive, and the number of resulting products/services is considerably large, it is likely to be a process. 

The second main difference is that process has–by definition–to contribute to the creation of customer value. It is always end-to-end.

Note, however, that precise delineation is subject to scope and degree of resolution. Each project certainly includes processes whereas the implementation of a new business process may be seen as a project itself.  

Projects don’t substitute processes and project management does not replace process management.