TUGS is an acronym for 'towboats, utility boats, and supply vessels'. Yankson, Pulls, and YANKS are all types of tugboats. Yankson is a type of tugboat that is used to tow large ships, Pulls is a type of tugboat that is used to pull barges, and YANKS is a type of tugboat that is used to move supplies and materials. All three types of tugboats are essential for the transportation of goods and services on waterways.