actinic ray vs actinic radiation

actinic ray and actinic radiation both are nouns.

Word	Noun	Adjective	Verb	Adverb
actinic ray	Yes	No	No	No
actinic radiation	Yes	No	No	No

As nouns, actinic ray and actinic radiation are synonyms defined as:

actinic ray and actinic radiation: electromagnetic radiation that can produce photochemical reactions

actinic ray (noun)	actinic radiation (noun)
electromagnetic radiation that can produce photochemical reactions	electromagnetic radiation that can produce photochemical reactions