A seven faced body would be called a "heptahedron"
There are no regular heptahedra (with all the faces the same shape and size).
If you cut off the corner of a cube you will get a seven faced, 3 dimensional body.
Pentagonal Prism
A pentagonal prism, a hexagonal pyramid, a cube with one vertex (corner) cut off, a tetrahedron with three vertices cut off - these are some of the possibilities.
A pentangonal prism has five rectangle faces and two pentangon shape sides.
A seven-sided shape (polygon) is called a heptagon.
-5
The number of vertices does not determine the number of faces. If the shape with 6 vertices was a quadrilateral based bipyramid, it would have 8 faces. A hexagonal based pyramid has 7 vertices and 7 faces. So more vertices does not necessarily imply more faces.
lateral faces
It is impossible, A shape has to have faces. But if you can have faces, then it is a dodecagon
what is a shape with twelve faces called
There is no shape which has only circular faces.
A hexagonal based pyramid seems to fit the given description
A shape that has some triangular faces is a pyramid.