The term SEA FLIER is composed of four crossword solutions: ERN (3 letters), GULL (4 letters), TERN (4 letters), and ERNE (4 letters). An ERN is a type of small, migratory bird that is found in Europe, Asia, and Africa. GULLs are seabirds that are typically found near coasts and lakes. TERNs are also seabirds that are related to gulls, but they have a more pointed bill and longer wings. ERNEs are a type of large, fish-eating bird that is found in Europe, Asia, and Africa. All four of these birds are considered sea fliers, as they are all capable of flying over the ocean.