sunblock vs sun blocker

sunblock and sun blocker both are nouns.

Word	Noun	Adjective	Verb	Adverb
sunblock	Yes	No	No	No
sun blocker	Yes	No	No	No

As nouns, sunblock and sun blocker are synonyms defined as:

sunblock and sun blocker: 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 sunscreen.

sunblock (noun)	sun blocker (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