quaternary vs digit

quaternary and digit both are nouns.

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

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

Other hypernyms of quaternary include figure.

quaternary (noun)	digit (noun)
the cardinal number that is the sum of three and one	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

quaternary (adjective)	digit (adjective)
consisting of or especially arranged in sets of four
coming next after the third and just before the fifth in position or time or degree or magnitude