How is a parallelogram different from a rhombus?
Technically, a rhombus is a parallelogram, but a parallelogram
is not always a rhombus. A parallelogram is any four-sided shape
with two sets of parallel lines. A rhombus is a parallelogram with
all equivalent side lengths. So, a rhombus is a more specific
parallelogram. (And so is a a square or a rectangle.)