radiology vs radiological

radiology is a noun but radiological is not a noun.

Word	Noun	Adjective	Verb	Adverb
radiology	Yes	No	No	No
radiological	No	Yes	No	No

radiology (noun)	radiological (noun)
(radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation
the branch of medical science dealing with the medical use of X-rays or other penetrating radiation

radiology (adjective)	radiological (adjective)
	of or relating to radiology