Term	Working meaning
Castle	Fortified residence or seat of power.
Fortress	Large defensive stronghold where military purpose dominates.
Citadel	Strongest defended core of a city or larger complex.
Palace	Prestigious residence or state complex centred on ceremony and authority.
Manor house	Principal residence of a manor or landed estate.
Keep	Major fortified building within a castle.
Curtain wall	Defensive wall connecting towers and enclosing a court.
Gatehouse	Building controlling passage through an enclosure.
Moat	Wet or dry defensive or boundary ditch.
Official residence	Building institutionally assigned to an officeholder; not an architectural type.
Restoration	Work intended to return a place toward an earlier known state.
Reconstruction	Re-creation of missing fabric based on evidence.