1) Apartment 2) Duplex apartment 3) Flat 4) French word used in English 5) Maisonnette 6) Small house 1) Duplex apartment 2) Maisonnette 
A flat that has more than one floor.
A flat on two levels with internal stairs and/or its own street-level front door.
[n] - a self-contained apartment (usually on two floors) in a larger house and with its own entrance from the outside 2. [n] - (French) a small house
maisonnette noun a small house