edifice,
building a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice"
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= antonym
= related word
Wiktionary
summerhouse (Noun) A house owned not as a primary residence and used during warm weather months of the year.
summerhouse (Noun) A house designed to be cool and used as a residence only during warm weather.
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