digital vs digit

digital is not a noun while digit is a noun.

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

digital (noun)	digit (noun)
	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

digital (adjective)	digit (adjective)
of a circuit or device that represents magnitudes in digits
relating to or performed with the fingers
displaying numbers rather than scale positions