low-level vs assistant

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

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

low-level (noun)	assistant (noun)
	a person who contributes to the fulfillment of a need or furtherance of an effort or purpose

low-level (adjective)	assistant (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
occurring at a relatively low altitude
not intense