cardhouse vs cardcastle

cardhouse and cardcastle both are nouns.

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

As nouns, cardhouse and cardcastle are synonyms defined as:

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

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