medical specialty vs confirming

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

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

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

medical specialty (adjective)	confirming (adjective)
	indicating existence or presence of a suspected condition or pathogen
	serving to support or corroborate