finger vs linear unit

finger and linear unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
finger	Yes	No	Yes	No
linear unit	Yes	No	No	No

As nouns, linear unit is a hypernym of finger; that is, linear unit is a word with a broader meaning than finger:

Other hypernyms of finger include linear measure.

finger (noun)	linear unit (noun)
one of the parts of a glove that provides covering for a finger or thumb	a unit of measurement of length
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)	linear unit (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