bulletin board vs bbs

bulletin board and bbs both are nouns.

Word	Noun	Adjective	Verb	Adverb
bulletin board	Yes	No	No	No
bbs	Yes	No	No	No

As nouns, bulletin board and bbs are synonyms defined as:

bulletin board and bbs: a computer that is running software that allows users to leave messages and access information of general interest

Other synonyms of bulletin board include bulletin board system, electronic bulletin board.

bulletin board (noun)	bbs (noun)
a board that hangs on a wall; displays announcements	a computer that is running software that allows users to leave messages and access information of general interest
a computer that is running software that allows users to leave messages and access information of general interest