sunray vs sun-ray

sunray and sun-ray both are nouns.

Word	Noun	Adjective	Verb	Adverb
sunray	Yes	No	No	No
sun-ray	Yes	No	No	No

As nouns, sunray and sun-ray are synonyms defined as:

sunray and sun-ray: a ray of artificial ultraviolet light from a sunray lamp

sunray (noun)	sun-ray (noun)
a ray of sunlight	a ray of artificial ultraviolet light from a sunray lamp
a ray of artificial ultraviolet light from a sunray lamp
herb having a basal cluster of grey-green leaves and leafless stalks each with a solitary broad yellow flower head; desert areas Idaho to Arizona