lowly vs junior

lowly is not a noun while junior is a noun.

Word	Noun	Adjective	Verb	Adverb
lowly	No	Yes	No	No
junior	Yes	Yes	No	No

lowly (noun)	junior (noun)
	the younger of two persons
	a third-year undergraduate
	term of address for a disrespectful and annoying male

lowly (adjective)	junior (adjective)
low or inferior in station or quality	younger; lower in rank; shorter in length of tenure or service
inferior in rank or status	used of the third or next to final year in United States high school or college
of low birth or station (`base' is archaic in this sense)	including or intended for youthful persons
used of unskilled work (especially domestic work)