binary digit vs digit

binary digit and digit both are nouns.

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

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

Other hypernyms of binary digit include figure.

binary digit (noun)	digit (noun)
either 0 or 1 in binary notation	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