house of cards vs card-house

house of cards and card-house both are nouns.

Word	Noun	Adjective	Verb	Adverb
house of cards	Yes	No	No	No
card-house	Yes	No	No	No

As nouns, house of cards and card-house are synonyms defined as:

house of cards and card-house: an unstable construction with playing cards

Other synonyms of house of cards include cardcastle, cardhouse.

house of cards (noun)	card-house (noun)
an unstable construction with playing cards	an unstable construction with playing cards
a speculative scheme that depends on unstable factors that the planner cannot control