The term 'Plastic Alternative' can be summarized by two crossword solutions: PAPER (5 letters) and CASH (4 letters). PAPER is a material made from wood pulp, cotton, or other plant fibers that is used for writing, printing, packaging, and many other purposes. CASH is a form of payment that is made with physical currency, such as coins and PAPER money. Both PAPER and CASH are alternatives to plastic, which is a synthetic material made from petroleum-based chemicals that is used in many consumer products.