low-level vs adjunct

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

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

low-level (noun)	adjunct (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

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