colloquialism vs formulation

colloquialism and formulation both are nouns.

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

As nouns, formulation is a hypernym of colloquialism; that is, formulation is a word with a broader meaning than colloquialism:

colloquialism: a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
formulation: the style of expressing yourself

Other hypernyms of colloquialism include expression.

colloquialism (noun)	formulation (noun)
a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech	inventing or contriving an idea or explanation and formulating it mentally
	the style of expressing yourself
	a substance prepared according to a formula