trapezoid bone vs trapezoid

trapezoid bone and trapezoid both are nouns.

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

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

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

Other synonyms of trapezoid bone include os trapezoideum.

trapezoid bone (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