I posted a link to one just below in related links.
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A hexagonal dipyramid - two hexagonal pyramids stuck together along their hexagonal face..
The three pyramids that i know of is a :) Triangular based pyramid :) Square based pyramid :) Hexagonal based pyramid
There are many possibilities. Some of them are: A nonagon-based pyramid. A hexagonal prism. A hexagonal dipyramid (two hexagon-based pyramids stuck together on their bases).
A triangular prism has 5 faces. Pentagonal prisms and hexagonal pyramids have 7.
An octahedron. A heptagonal pyramid or a hexagonal prism or two quadrilateral pyramids attached at their bases. There are probably other configurations as well.