The term 'Supporter of the North' can be described as a Unionist, which is an 8-letter word. A Unionist is someone who supports the preservation of the Union between the United States and its states during the American Civil War. Unionists were typically found in the northern states, and they opposed the secession of the southern states. They believed that the Union should remain intact and that the states should not be allowed to secede. Unionists were also known for their support of Abraham Lincoln and his policies.