petty vs junior

petty and junior both are nouns.

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

petty (noun)	junior (noun)
larceny of property having a value less than some amount (the amount varies by locale)	the younger of two persons
	a third-year undergraduate
	term of address for a disrespectful and annoying male

petty (adjective)	junior (adjective)
inferior in rank or status	younger; lower in rank; shorter in length of tenure or service
contemptibly narrow in outlook	used of the third or next to final year in United States high school or college
(informal) small and of little importance	including or intended for youthful persons