under vs low-level

under and low-level both are adjectives.

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

under (adjective)	low-level (adjective)
located below or beneath something else	lower in rank or importance
lower in rank, power, or authority	at a low level in rank or importance
	occurring at a relatively low altitude
	not intense

under (adverb)	low-level (adverb)
further down
down below
below the horizon
below some quantity or limit
in or into a state of subordination or subjugation
down to defeat, death, or ruin
into unconsciousness
through a range downward