The term 'BICYCLE PACK' can be broken down into two words, 'BICYCLE' and 'PACK'. The crossword solution for the word 'DECK' is a four-letter word that can be used to describe the top of a BICYCLE. A BICYCLE DECK is the flat surface at the top of the frame where the rider stands while pedaling. It is usually made of metal or plastic and is designed to provide a stable platform for the rider. The DECK also serves as a mounting point for accessories such as lights, bells, and baskets.