DSL vs digital subscriber line

DSL and digital subscriber line both are nouns.

Word	Noun	Adjective	Verb	Adverb
DSL	Yes	No	No	No
digital subscriber line	Yes	No	No	No

As nouns, DSL and digital subscriber line are synonyms defined as:

DSL and digital subscriber line: a generic name for digital lines that are provided by telephone companies to their local subscribers and that carry data at high speeds

DSL (noun)	digital subscriber line (noun)
a generic name for digital lines that are provided by telephone companies to their local subscribers and that carry data at high speeds	a generic name for digital lines that are provided by telephone companies to their local subscribers and that carry data at high speeds