The term SEA CREATURE THAT STINGS can be summarized by the 9-letter word JELLYFISH. JELLYFISH are aquatic invertebrates that have a gelatinous bell-shaped body and long tentacles with stinging cells. They are found in all oceans and can range in size from less than an inch to over 6 feet in diameter. JELLYFISH are known for their painful sting, which can cause a variety of symptoms including pain, swelling, and itching.