Trapezoid
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In geometry, a trapezoid in North American English, or trapezium in British English, is a quadrilateral that has at least one pair of parallel sides.
The Temple of Dendur in the Metropolitan Museum of Art in New York City
Example of a trapeziform pronotum outlined on a spurge bug
Piazza del Campidoglio viewed from directly above.
Rhombus
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In geometry, a rhombus is an equilateral quadrilateral, a quadrilateral whose four sides all have the same length. Other names for rhombus include diamond, lozenge, and calisson.
Trapezoid
…geometry of Euclid's Elements (c. 300 BC), quadrilaterals were classified into exclusive categories: square; oblong (non-square rectangle); (non-square) rhombus; rhomboid, meaning a non-rhombus non-rectangle parallelogram; or trapezium (τραπέζιον, literally "table"), meaning any quadrilateral not already included…
An ICM photo with a diamond-shaped composition.
Rhombicdodecahedron