metacarpal vs metacarpal bone

metacarpal and metacarpal bone both are nouns.

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

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

metacarpal and metacarpal bone: any bone of the hand between the wrist and fingers

metacarpal (noun)	metacarpal bone (noun)
any bone of the hand between the wrist and fingers	any bone of the hand between the wrist and fingers

metacarpal (adjective)	metacarpal bone (adjective)
of or relating to the metacarpus