The term 'Razorback' is a nickname for several different animals and an athletic team. The three letter solution for the crossword is 'HOG, ' which is a common name for a wild pig. The four letter solution is 'BOAR, ' which is another name for a wild pig. The seven letter solution is 'FINBACK, ' which is a type of whale. The five letter solution is 'RIDGE, ' which is a type of land formation. Finally, the fifteen letter solution is 'ARKANSASATHLETE, ' which is the nickname for the athletic teams at the University of Arkansas.