As nouns the difference between digram and bigram
is that digram is a digraph while bigram is a pair, often of words or tags, used in analysis.
bigram
English
Noun
(
en noun)
(linguistics) a pair, often of words or tags, used in analysis.
Usage notes
* Often used attributively - "bigram model".
Hypernyms
* n-gram
Coordinate terms
* trigram