neurology vs neurological

neurology is a noun but neurological is not a noun.

Word	Noun	Adjective	Verb	Adverb
neurology	Yes	No	No	No
neurological	No	Yes	No	No

neurology (noun)	neurological (noun)
the branch of medical science that deals with the nervous system
(neurology) the branch of medicine that deals with the nervous system and its disorders

neurology (adjective)	neurological (adjective)
	of or relating to or used in or practicing neurology