bus vs minibus

bus and minibus both are nouns.

Word	Noun	Adjective	Verb	Adverb
bus	Yes	No	Yes	No
minibus	Yes	No	No	No

As nouns, minibus is a hyponym of bus; that is, minibus is a word with a more specific, narrower meaning than bus:

Other hyponyms of bus include school bus, trackless trolley, trolley coach, trolleybus.

bus (noun)	minibus (noun)
a vehicle carrying many passengers; used for public transport	a light bus (4 to 10 passengers)
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

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