The crossword solution for the term CERTAIN PEWTERS is LEYS, a four-letter word. LEYS is an alloy of tin and lead, which is used to make pewter. Pewter is a metal alloy that has been used since ancient times for a variety of purposes, including making jewelry, tableware, and other decorative items. Certain pewters are composed of LEYS, which is why it was the answer to this crossword puzzle.