sunray vs ultraviolet radiation

sunray and ultraviolet radiation both are nouns.

Word	Noun	Adjective	Verb	Adverb
sunray	Yes	No	No	No
ultraviolet radiation	Yes	No	No	No

As nouns, ultraviolet radiation is a hypernym of sunray; that is, ultraviolet radiation is a word with a broader meaning than sunray:

sunray: a ray of artificial ultraviolet light from a sunray lamp
ultraviolet radiation: radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays

Other hypernyms of sunray include ultraviolet, ultraviolet illumination, ultraviolet light, UV.

sunray (noun)	ultraviolet radiation (noun)
a ray of sunlight	radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays
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