knuckle vs finger

knuckle and finger both are nouns.

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

knuckle (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

knuckle (verb)	finger (verb)
press or rub with the knuckles	indicate the fingering for the playing of musical scores for keyboard instruments
shoot a marble while keeping one's knuckles on the ground	feel or handle with the fingers
	search for on the computer
	examine by touch