trapezoid vs os trapezoideum

trapezoid and os trapezoideum both are nouns.

Word	Noun	Adjective	Verb	Adverb
trapezoid	Yes	No	No	No
os trapezoideum	Yes	No	No	No

As nouns, trapezoid and os trapezoideum are synonyms defined as:

trapezoid and os trapezoideum: the wrist bone between the trapezium and the capitate bones

Other synonyms of trapezoid include trapezoid bone.

trapezoid (noun)	os trapezoideum (noun)
the wrist bone between the trapezium and the capitate bones	the wrist bone between the trapezium and the capitate bones
a quadrilateral with two parallel sides