VI vs digit

VI and digit both are nouns.

Word	Noun	Adjective	Verb	Adverb
VI	Yes	No	No	No
digit	Yes	No	No	No

As nouns, digit is a hypernym of VI; that is, digit is a word with a broader meaning than VI:

Other hypernyms of VI include figure.

VI (noun)	digit (noun)
more than 130 southeastern Virgin Islands; a dependent territory of the United States	a finger or toe in human beings or corresponding body part in other vertebrates
the cardinal number that is the sum of five and one	one of the elements that collectively form a system of numeration
	the length of breadth of a finger used as a linear measure