triad vs digit

triad and digit both are nouns.

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

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

Other hypernyms of triad include figure.

triad (noun)	digit (noun)
a three-note major or minor chord; a note and its third and fifth tones	a finger or toe in human beings or corresponding body part in other vertebrates
three people considered as a unit	one of the elements that collectively form a system of numeration
a set of three similar things considered as a unit	the length of breadth of a finger used as a linear measure
the cardinal number that is the sum of one and one and one