trapezium bone vs trapezium

trapezium bone and trapezium both are nouns.

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

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

trapezium bone and trapezium: the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals

Other synonyms of trapezium bone include os trapezium.

trapezium bone (noun)	trapezium (noun)
the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals	the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals
	a quadrilateral with no parallel sides