irradiation vs medical specialty

irradiation and medical specialty both are nouns.

Word	Noun	Adjective	Verb	Adverb
irradiation	Yes	No	No	No
medical specialty	Yes	No	No	No

irradiation (noun)	medical specialty (noun)
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance	the branches of medical science that deal with nonsurgical techniques
the apparent enlargement of a bright object when viewed against a dark background
(Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus
(physiology) the spread of sensory neural impulses in the cortex
a column of light (as from a beacon)
the condition of being exposed to radiation