Nouns

(n)omnibusan anthology of articles on a related subject or an anthology of the works of a single author
(n)bus, autobus, coach, charabanc, double-decker, jitney, motorbus, motorcoach, omnibus, passenger vehiclea vehicle carrying many passengers; used for public transport“he always rode the bus to work”

Adjectives

(s)omnibusproviding for many things at once“an omnibus law”