I do know that love has many types and forms. It is a word that should not be used lightly, and it can be an elusive entity. Friendship is a special bond between two people that can range from spouse to occasional social contact.
Clearly there are differences, but there is also enough intermixing that specific descriptions can be hard to define. We love some of our friends, which blurs the definitional lines. And yet, we each know which person fits the individual categories, and I suppose that most of the time that is all that matters.