finger vs fingertip

finger and fingertip both are nouns.

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

finger (noun)	fingertip (noun)
one of the parts of a glove that provides covering for a finger or thumb	the end (tip) of a finger
any of the terminal members of the hand (sometimes excepting the thumb)
the length of breadth of a finger used as a linear measure

finger (verb)	fingertip (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