sunblock vs sunscreen

sunblock and sunscreen both are nouns.

Word	Noun	Adjective	Verb	Adverb
sunblock	Yes	No	No	No
sunscreen	Yes	No	No	No

As nouns, sunblock and sunscreen are synonyms defined as:

sunblock and sunscreen: a cream spread on the skin; contains a chemical (as PABA) to filter out ultraviolet light and so protect from sunburn

Other synonyms of sunblock include sun blocker.

sunblock (noun)	sunscreen (noun)
a cream spread on the skin; contains a chemical (as PABA) to filter out ultraviolet light and so protect from sunburn	a cream spread on the skin; contains a chemical (as PABA) to filter out ultraviolet light and so protect from sunburn