The term 'Flying Fish-Eater' can be broken down into two crossword solutions: ERNE (4 letters) and ERN (3 letters). ERNE is a type of large seabird, also known as the White-Tailed Eagle, which is found in northern Europe, Asia, and North America. It is a powerful bird of prey that feeds mainly on fish, including flying fish. ERN is a smaller species of seabird, also known as the Lesser Black-Backed Gull, which is found in Europe, Asia, and North America. It is a scavenger that feeds on a variety of food sources, including flying fish. Both of these birds are adept at catching flying fish, making them both fitting solutions for the term 'Flying Fish-Eater'.