der Schulbus
school bus
A bus used specifically to transport students to school and back home again.
Jeden Morgen um Viertel vor acht fährt der Schulbus ab.
Every morning at quarter to eight, the school bus leaves.

school bus
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school bus
A bus used specifically to transport students to school and back home again.
Jeden Morgen um Viertel vor acht fährt der Schulbus ab.
Every morning at quarter to eight, the school bus leaves.

The word is made up of 'die Schule' (school) and 'der Bus' (bus). So it describes a bus that has a connection to school.
Der Schulbus hält direkt vor unserer Haustür.
The school bus stops right in front of our front door.
To express that someone uses this means of transportation, the preposition 'mit' followed by the dative is used very frequently.
Meine Tochter fährt jeden Tag mit dem Schulbus zur Schule.
My daughter takes the school bus to school every day.
Common verbs in connection with 'Schulbus' (school bus) are 'den Schulbus nehmen' (to take the school bus), 'den Schulbus verpassen' (to miss the school bus), or 'auf den Schulbus warten' (to wait for the school bus).
Wenn ich morgens zu spät aufstehe, verpasse ich den Schulbus.
If I get up too late in the morning, I miss the school bus.
bus
'der Bus' and 'der Schulbus' both refer to a large vehicle that transports several people. 'Bus' is the general word for public trips along a fixed route. 'Schulbus' is more specific: it takes schoolchildren to school or back home. Learners may confuse the words because a school bus is also a bus. If you are not specifically talking about transport to school, 'Bus' is enough. If the trip is clearly connected with school and students, 'Schulbus' is more precise.

Die Eltern warten, bis der Schulbus vor dem Haus hält.
The parents wait until the school bus stops in front of the house.
An der Haltestelle warten viele Leute auf den Bus in die Innenstadt.
At the stop, many people are waiting for the bus to the city center.