The term 'Grain Transporter' can be summarized by the 6-letter word 'HOPPER'. A HOPPER is a type of transport vehicle used to move grain from one place to another. It is typically a large, open-topped container with a wide opening at the top and a narrow opening at the bottom. The grain is loaded into the HOPPER and then transported to its destination. The HOPPER is designed to keep the grain contained and prevent it from spilling out during transport.