trapezoid bone vs os trapezoideum

trapezoid bone and os trapezoideum both are nouns.

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

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

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

Other synonyms of trapezoid bone include trapezoid.

trapezoid bone (noun)	os trapezoideum (noun)
the wrist bone between the trapezium and the capitate bones	the wrist bone between the trapezium and the capitate bones