triplet vs digit

triplet and digit both are nouns.

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

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

Other hypernyms of triplet include figure.

triplet (noun)	digit (noun)
a set of three similar things considered as a unit	a finger or toe in human beings or corresponding body part in other vertebrates
one of three offspring born at the same time from the same pregnancy	one of the elements that collectively form a system of numeration
the cardinal number that is the sum of one and one and one	the length of breadth of a finger used as a linear measure