Any flat surface or area; a platform. / A flat landscape. / A landscape lacking distinguishable or interesting features; a plain or monotonous landscape.

plural of flatsedge

Any of various sedges in the genus Cyperus.

plural of flatscape

(of a log of wood) Sawn without any change of orientation of the blade between planks.

A person who shares a flat (apartment).

plural of flatsharer

The sharing of a flat (apartment building) between multiple tenants.