snogging vs colloquialism

snogging and colloquialism both are nouns.

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

snogging (noun)	colloquialism (noun)
(British informal) cuddle and kiss	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech