adjunct vs appurtenant

adjunct is a noun but appurtenant is not a noun.

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

As adjectives, adjunct and appurtenant are synonyms defined as:

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

adjunct (noun)	appurtenant (noun)
a construction that can be used to extend the meaning of a word or phrase but is not one of the main constituents of a sentence
something added to another thing but not an essential part of it
a person who is an assistant or subordinate to another

adjunct (adjective)	appurtenant (adjective)
of or relating to a person who is subordinate to another	furnishing added support
furnishing added support