knuckle joint vs finger

knuckle joint and finger both are nouns.

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

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

knuckle 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