parallelogram
a quadrilateral with both pairs of opposite sides parallel
rhombus
a parallelogram with 4 congruent sides
rectangle
a parallelogram with 4 right angles
square
a parallelogram with 4 congruent sides and 4 right angles
kite
a quadrilateral with 2 pairs of adjacent sides congruent and no opposite sides congruent
trapezoid
a quadrilateral with exactly one pair of adjacent parallel sides
isosceles trapezoid
a trapezoid whose nonparallel opposite sides are congruent