sunburst vs sun

sunburst and sun both are nouns.

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

As nouns, sun is a hypernym of sunburst; that is, sun is a word with a broader meaning than sunburst:

Other hypernyms of sunburst include sunlight, sunshine.

sunburst (noun)	sun (noun)
a jeweled brooch with a pattern resembling the sun	any star around which a planetary system revolves
a design consisting of a central disk resembling the sun and rays emanating from it	the star that is the source of light and heat for the planets in the solar system
a sudden emergence of the sun from behind clouds	a person considered as a source of warmth or energy or glory etc
	the rays of the sun

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