smash hit vs figure of speech

smash hit and figure of speech both are nouns.

Word	Noun	Adjective	Verb	Adverb
smash hit	Yes	No	No	No
figure of speech	Yes	No	No	No

smash hit (noun)	figure of speech (noun)
an unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel)	language used in a figurative or nonliteral sense