finger's breadth vs digit

finger's breadth and digit both are nouns.

Word	Noun	Adjective	Verb	Adverb
finger's breadth	Yes	No	No	No
digit	Yes	No	No	No

As nouns, finger's breadth and digit are synonyms defined as:

finger's breadth and digit: the length of breadth of a finger used as a linear measure

Other synonyms of finger's breadth include finger, fingerbreadth.

finger's breadth (noun)	digit (noun)
the length of breadth of a finger used as a linear measure	a finger or toe in human beings or corresponding body part in other vertebrates
	one of the elements that collectively form a system of numeration
	the length of breadth of a finger used as a linear measure