The term 'bloodsucking creature' can be summarized by the word LEECH, which is a five-letter word. Leeches are small, segmented worms that feed on the blood of other animals. They have been used in medicine for centuries to treat a variety of ailments, and they are still used today in some medical treatments. Leeches attach themselves to their host and suck their blood until they are full, then drop off and digest the meal.