colloquialism vs suspicious

colloquialism is a noun but suspicious is not a noun.

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

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

colloquialism (adjective)	suspicious (adjective)
	openly distrustful and unwilling to confide
	not as expected