Modifiers matching billfish:

• oceanic,
• larger,
• threatened,
• exotic,
• large,

Simple categories matching threatened:

• waterfowl,
• animal,
• bird,
• species,
• reptile,
• waterbird,
• carnivore,
• fish,
• marsupial,
• creature,
• mammal,
• predator,
• ecosystem,
• fauna,
• billfish,
• group,