economical vs colloquialism

economical is not a noun while colloquialism is a noun.

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

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

economical (adjective)	colloquialism (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