radiation vs medical specialty

radiation and medical specialty both are nouns.

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

radiation (noun)	medical specialty (noun)
the act of spreading outward from a central source	the branches of medical science that deal with nonsurgical techniques
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
a radial arrangement of nerve fibers connecting different parts of the brain
the spread of a group of organisms into new habitats
energy that is radiated or transmitted in the form of rays or waves or particles
the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours