A trapezoid (or trapezium) has at least one pair of parallel sides.
If you asked, "Name all the types of quadrilaterals which have at least one pair of parallel sides?", I would answer: Trapezoid, rhombus, parallelogram, rectangle and square.
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A trapezium and a parallelogram are both quadrilaterals with at least one pair of parallel sides.
Trapezoids. All other quadrilaterals either have two pairs of parallel sides or none.
trapezoid
There is no quadrilateral on that list that has only 1 pair of parallel sides.