information processing system vs bus

information processing system and bus both are nouns.

Word	Noun	Adjective	Verb	Adverb
information processing system	Yes	No	No	No
bus	Yes	No	Yes	No

information processing system (noun)	bus (noun)
a machine for performing calculations automatically	a vehicle carrying many passengers; used for public transport
	a car that is old and unreliable
	an electrical conductor that makes a common connection between several circuits
	the topology of a network whose components are connected by a busbar

information processing system (verb)	bus (verb)
	remove used dishes from the table in restaurants
	ride in a bus
	send or move around by bus