data communication vs digital communication

data communication and digital communication both are nouns.

Word	Noun	Adjective	Verb	Adverb
data communication	Yes	No	No	No
digital communication	Yes	No	No	No

As nouns, data communication and digital communication are synonyms defined as:

data communication and digital communication: electronic transmission of information that has been encoded digitally (as for storage and processing by computers)

data communication (noun)	digital communication (noun)
electronic transmission of information that has been encoded digitally (as for storage and processing by computers)	electronic transmission of information that has been encoded digitally (as for storage and processing by computers)