sunray vs sunbeam

sunray and sunbeam both are nouns.

Word	Noun	Adjective	Verb	Adverb
sunray	Yes	No	No	No
sunbeam	Yes	No	No	No

As nouns, sunray and sunbeam are synonyms defined as:

sunray (noun)	sunbeam (noun)
a ray of sunlight	a ray of sunlight
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