inferior vs low-level

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

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

inferior (noun)	low-level (noun)
a character or symbol set or printed or written beneath or slightly below and to the side of another character
one of lesser rank or station or quality

inferior (adjective)	low-level (adjective)
written or printed below and to one side of another character	lower in rank or importance
of or characteristic of low rank or importance	at a low level in rank or importance
of low or inferior quality	occurring at a relatively low altitude
having an orbit between the sun and the Earth's orbit	not intense
lower than a given reference point
falling short of some prescribed norm