adjunct vs low-level

adjunct is a noun but low-level is not a noun.

Word	Noun	Adjective	Verb	Adverb
adjunct	Yes	Yes	No	No
low-level	No	Yes	No	No

adjunct (noun)	low-level (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)	low-level (adjective)
of or relating to a person who is subordinate to another	lower in rank or importance
furnishing added support	at a low level in rank or importance
	occurring at a relatively low altitude
	not intense