X-ray therapy vs actinotherapy

X-ray therapy and actinotherapy both are nouns.

Word	Noun	Adjective	Verb	Adverb
X-ray therapy	Yes	No	No	No
actinotherapy	Yes	No	No	No

As nouns, actinotherapy is a hypernym of X-ray therapy; that is, actinotherapy is a word with a broader meaning than X-ray therapy:

X-ray therapy: the therapeutic use of X rays
actinotherapy: (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance

Other hypernyms of X-ray therapy include irradiation, radiation, radiation therapy, radiotherapy.

X-ray therapy (noun)	actinotherapy (noun)
the therapeutic use of X rays	(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance