appurtenant vs auxiliary

appurtenant is not a noun while auxiliary is a noun.

Word	Noun	Adjective	Verb	Adverb
appurtenant	No	Yes	No	No
auxiliary	Yes	Yes	No	No

As adjectives, appurtenant and auxiliary are synonyms defined as:

Other synonyms of appurtenant include accessory, adjunct, adjuvant, ancillary.

appurtenant (noun)	auxiliary (noun)
	someone who acts as assistant

appurtenant (adjective)	auxiliary (adjective)
furnishing added support	functioning in a supporting capacity
	furnishing added support