No. That is because there is no such word as "roumbus". A rhombus, on the other hand, IS a polygon. It is a quadrilateral.
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If a quadrilaterl has a perpendicular diagonas it is a roumbus, also kite has perperndicular diagonals
it seems to me that the only polygon of your description is a square
A type of polygon is a rhombusial polygon, trysectalnict polygon, and a equilateral polygon.
A triangle (not traingle) is a polygon. It can be a regular polygon but need not be.
an arrow is or isn't a polygon?