dickey-bird vs colloquialism

dickey-bird and colloquialism both are nouns.

Word	Noun	Adjective	Verb	Adverb
dickey-bird	Yes	No	No	No
colloquialism	Yes	No	No	No

dickey-bird (noun)	colloquialism (noun)
small bird; adults talking to children sometimes use these words to refer to small birds	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech