The crossword solution for the term 'Word for a Keeper?' is STET, which is a four-letter word. STET is a Latin word meaning 'let it stand' and is used in proofreading to indicate that a correction or alteration should be disregarded. It is also used as a verb to mean 'to disregard a correction or alteration'. STET is commonly used in the publishing industry to indicate that an editor or proofreader has decided not to make a suggested change.