cardcastle vs cardhouse

cardcastle and cardhouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
cardcastle	Yes	No	No	No
cardhouse	Yes	No	No	No

As nouns, cardcastle and cardhouse are synonyms defined as:

Other synonyms of cardcastle include card-house, house of cards.

cardcastle (noun)	cardhouse (noun)
an unstable construction with playing cards	an unstable construction with playing cards