quadrangle vs trapezium

quadrangle and trapezium both are nouns.

Word	Noun	Adjective	Verb	Adverb
quadrangle	Yes	No	No	No
trapezium	Yes	No	No	No

As nouns, trapezium is a hyponym of quadrangle; that is, trapezium is a word with a more specific, narrower meaning than quadrangle:

Other hyponyms of quadrangle include parallelogram, trapezoid.

quadrangle (noun)	trapezium (noun)
a rectangular area surrounded on all sides by buildings	the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals
a four-sided polygon	a quadrilateral with no parallel sides