tetrahedron
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A hexagonal pyramid has only and also 7 faces.
A triangular pyramid has 5 planes. * * * * * In fact, a triangular pyramid is also known as a tetrahedron and as its name suggests, it has 4 plane faces.
The bottom, or base of a pyramid would count as a face is you were finding out surface area.
You could have GIZA or a pyramid. Also a square house if your really desperate.
A frustum. Specifically, a frustum of a triangular pyramid -- as one could also have a frustum of a cone, square pyramid, etc.Read more: What_do_you_call_a_triangular_pyramid_with_the_top_cut_off