os trapezoideum vs trapezoid

os trapezoideum and trapezoid both are nouns.

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

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

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

Other synonyms of os trapezoideum include trapezoid bone.

os trapezoideum (noun)	trapezoid (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