Yes! Sunblock deflects UV rays while sunscreen absorbs them. Put it another way, the former refers to a physical sunblock and the latter, a chemical sunblock. Yet, most of us use both words interchangeably.
In my earlier entry, What’s The Correct Sunblock Dosage?, I’ve already explained that physical sunblocks are those that uses titanium dioxide or zinc oxide to reflect or scatter UV radiation before it reaches our skin. Chemical sunblocks on the other hand, use organic absorber to absorb UV rays and invalid the damage of UV achieving a full blockage of a broad spectrum UV rays.