The term "water-tiger" typically refers to the ferocious and predatory nature of aquatic creatures, such as sharks and crocodiles. However, there are many synonyms that can be used to describe these creatures with equal accuracy. For example, one might use words like apex predator, hunter, or killer to describe the fearsome nature of these animals. Other synonyms might include aquatic predator, fish-eater, or sea monster. Whatever term is used, it is clear that these creatures are revered and feared in equal measure, and play an important role in the ecosystem of the world's oceans and waterways.