medical specialty vs noninvasive

medical specialty is a noun but noninvasive is not a noun.

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

medical specialty (noun)	noninvasive (noun)
the branches of medical science that deal with nonsurgical techniques

medical specialty (adjective)	noninvasive (adjective)
	relating to a technique that does not involve puncturing the skin or entering a body cavity