petty vs colloquialism

petty and colloquialism both are nouns.

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

petty (noun)	colloquialism (noun)
larceny of property having a value less than some amount (the amount varies by locale)	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech

petty (adjective)	colloquialism (adjective)
inferior in rank or status
contemptibly narrow in outlook
(informal) small and of little importance