They differ in their sources, methods, and criteria. The source of philosophy is the human mind, its method is thinking and its criterion conscience. Philosophy is the source of all human thought yet not every area produced by human thinking is termed philosophy because philosophy is the act of thinking and as such is distinct from both the power and the object of thinking. Science, Religion and other fields would not exist without philosophy, that is, philosophizing. Hence the science of Chemistry as well as that of Parenting, of Accounting as well as truck driving, or any science, is as once philosophy but also a separate field with a distinct name and discipline because it specializes in thinking in a specific area.
Philosophy is more than what salaried philosophers do.
It is something besides the field of Philosophy. Everyone can, and most do, wonder, question, analyze, think, conclude and hold something as true and good. Man does not live by Science alone nor would Religion or most other areas of life exist unless people had thought them out. People band together with others they agree with to promote what they see as the thinking thing to do. Such movements are also philosophy.