on-line database vs computer database

on-line database and computer database both are nouns.

Word	Noun	Adjective	Verb	Adverb
on-line database	Yes	No	No	No
computer database	Yes	No	No	No

As nouns, on-line database and computer database are synonyms defined as:

on-line database and computer database: (computer science) a database that can be accessed by computers

Other synonyms of on-line database include electronic database, electronic information service.

on-line database (noun)	computer database (noun)
(computer science) a database that can be accessed by computers	(computer science) a database that can be accessed by computers