The term 'FULL OF GREASE' can be described by two crossword solutions: OILY (4 letters) and FATTY (5 letters). OILY is an adjective that describes something covered in or saturated with oil, while FATTY is an adjective that describes something containing a lot of fat. Both terms are often used to describe food that is high in fat content, but they can also be used to describe objects that are covered in grease.