The term 'WORD AFTER FAST OR JUNK' is a crossword puzzle clue, and the solution is 'FOOD' (4 letters). FOOD is an essential part of life, providing us with the energy and nutrients we need to survive. It is also a source of pleasure, with many cultures having their own unique cuisines. Fast FOOD and junk FOOD are both types of FOOD, but they are generally considered to be unhealthy due to their high fat and sugar content.