The term 'SLIPPERY ONES' can be summarized by two crossword solutions: EELS (4 letters) and EVADERS (7 letters). Eels are a type of fish that are known for their slimy skin and ability to quickly move through water. They are also known for their ability to evade predators. Evaders are people or animals that are able to escape capture or danger by using cunning or speed. Both eels and evaders are considered slippery ones because of their ability to elude capture.