The term 'ocean flier' refers to a type of bird that is capable of flying over long distances across the ocean. The three crossword solutions for this term are ERN (3 letters), ERNE (4 letters) and TERN (4 letters). ERN is a species of small wading bird, ERNE is a large seabird, and TERN is a medium-sized seabird. All three of these birds are capable of flying long distances over the ocean, making them ocean fliers.