In the Azerbaijani language the words "house" and "palace" have various meanings.
Mulk is a foreign word which came from Arabia during Caliphate Era.
The word "Saray" is a castle, or government building which was considered to have particular administrative importance in various parts of the former Safavid Empire.
Imarat or Igamatgah are big house which belong to rich people, khans, shahs.
Now, the term "Villa" is very popular and modern in Azerbaijan since the 1990s for a capitalist system.