metacarpophalangeal joint vs finger

metacarpophalangeal joint and finger both are nouns.

Word	Noun	Adjective	Verb	Adverb
metacarpophalangeal joint	Yes	No	No	No
finger	Yes	No	Yes	No

metacarpophalangeal joint (noun)	finger (noun)
a joint of a finger when the fist is closed	one of the parts of a glove that provides covering for a finger or thumb
	any of the terminal members of the hand (sometimes excepting the thumb)
	the length of breadth of a finger used as a linear measure

metacarpophalangeal joint (verb)	finger (verb)
	indicate the fingering for the playing of musical scores for keyboard instruments
	feel or handle with the fingers
	search for on the computer
	examine by touch