Look up an image:
Explore by theme
elevation 
Vertical representation of the projection of the house.
basement 
Part of the house that is underground or partially so; it lies under the ground floor.
mezzanine floor 
Intermediate level created in an area having a high ceiling; it is accessible by interior stairs.
first floor 
Part of the house closest to ground level.
second floor 
Part of the house defined by a floor and a ceiling; it is located above the first floor.