colloquialism vs piddling

colloquialism is a noun but piddling is not a noun.

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

colloquialism (noun)	piddling (noun)
a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech

colloquialism (adjective)	piddling (adjective)
	(informal) small and of little importance