phototherapy vs actinotherapy

phototherapy and actinotherapy both are nouns.

Word	Noun	Adjective	Verb	Adverb
phototherapy	Yes	No	No	No
actinotherapy	Yes	No	No	No

As nouns, actinotherapy is a hypernym of phototherapy; that is, actinotherapy is a word with a broader meaning than phototherapy:

phototherapy: the use of strong light to treat acne or hyperbilirubinemia of the newborn
actinotherapy: (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance

Other hypernyms of phototherapy include irradiation, radiation, radiation therapy, radiotherapy.

phototherapy (noun)	actinotherapy (noun)
the use of strong light to treat acne or hyperbilirubinemia of the newborn	(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance