The term 'Heron Relative' refers to three species of birds that are closely related to herons. These species include the EGRET (5 letters), BITTERN (7 letters), and IBIS (4 letters). The EGRET is a white bird with long legs and a long neck, while the BITTERN is a brown bird with a shorter neck and legs. The IBIS is a long-legged wading bird with a curved bill. All three species are found in wetlands and other watery habitats.