rhombus and squuare
Although not a shape, in itself, the 7-letter adjective REGULAR means the shape has equal sides (and equal angles).
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A rhombus, which unlike a square, does not have to have all four ninety degree angles.
heptagon
Polygon
6 sides is a hexagon a shape with 7 sides is a heptagon don't get them mixed up and besides that question was already on wikianswers and it was answered
Rhombus Hexagon Octagon Nonagon Decagon all have 7 letters