Synonyms for Double-decker:

n.

All Terrain Vehicle, ATV, ambulance, camper, 4WD, breakdown truck, camper van, 18-wheeler. club sandwich, beefburger, blt, empanada, burger, enchilada, burrito, canape, bruschetta. double-decker (noun)
coach, jitney, autobus, bus, charabanc, motorbus, motorcoach, omnibus.

Other synonyms:

club sandwich, enchilada, blt, burrito, canape, bruschetta, burger, empanada. beefburger. Other relevant words:
canape, blt, ambulance, burger, enchilada, bruschetta, burrito, ATV, empanada, 18-wheeler, beefburger, 4WD, camper.