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Difference between Double-decker and Twin-deck

double-decker

1. a bus with an upper level:

  • Ride the bus just to say you rode a double decker, but stick to the Tube for speed and ease of use.

2. a sandwich with two layers of filling:

  • He was clearly more interested in eating a double decker and didn’t even have the decency to ask my name.

twin-deck

1. part of a music center with two cassette or CD recorders in it:

  • Make your own recordings with this twin deck CD recorder.

2. (attrib.) is used of aircraft that have an upper and a lower deck:

  • This twin-deck aircraft will carry more than 500 passengers in a three-class configuration.