What are some differences and similarities between a trapezoid and a square?

They both have 4 sides and 4 angles.

Trapezoid has 4 different length & angles, square has all same length and angles.

The difference between a square and a trapezoid is that first a square has equal sides while trapezoid does not have. The angles inside the square are perpendicular while trapezoid has not. A trapezoid also has one pair of non-parallel sides.