sunlight vs sunburst

sunlight and sunburst both are nouns.

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

As nouns, sunburst is a hyponym of sunlight; that is, sunburst is a word with a more specific, narrower meaning than sunlight:

sunlight (noun)	sunburst (noun)
the rays of the sun	a jeweled brooch with a pattern resembling the sun
	a design consisting of a central disk resembling the sun and rays emanating from it
	a sudden emergence of the sun from behind clouds