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sunblock
This term specifically refers to products that create a physical barrier on the skin to reflect or block UV rays, though in common usage it is often used interchangeably with sunscreen. While sunscreen typically refers to chemical filters that absorb radiation, sunblock implies a more opaque, protective shield.
As a noun, the word is typically treated as an uncountable mass noun when referring to the substance itself. However, it can be used as a countable noun when referring to specific types, brands, or individual bottles of the product.