sunshine vs sun

sunshine and sun both are nouns.

Word	Noun	Adjective	Verb	Adverb
sunshine	Yes	No	No	No
sun	Yes	No	Yes	No

As nouns, sunshine and sun are synonyms defined as:

Other synonyms of sunshine include sunlight.

sunshine (noun)	sun (noun)
the quality of being cheerful and dispelling gloom	any star around which a planetary system revolves
the rays of the sun	the star that is the source of light and heat for the planets in the solar system
moderate weather; suitable for outdoor activities	a person considered as a source of warmth or energy or glory etc
	the rays of the sun

sunshine (verb)	sun (verb)
	expose one's body to the sun
	expose to the rays of the sun or affect by exposure to the sun