Rhombus
Hexagon
Octagon
Nonagon
Decagon
all have 7 letters
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heptagon
rhombus and squuare Although not a shape, in itself, the 7-letter adjective REGULAR means the shape has equal sides (and equal angles).
scalene, have you ever been to school?
Pyramid.
A rhombus, which unlike a square, does not have to have all four ninety degree angles.