colloquialism vs economical

colloquialism is a noun but economical is not a noun.

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

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

colloquialism (adjective)	economical (adjective)
	of or relating to an economy, the system of production and management of material wealth
	using the minimum of time or resources necessary for effectiveness
	avoiding waste