The word ripener refers to something that helps in ripening or making something mature. Some synonyms for this word include maturing agent, fruit-ripening agent, or ripening catalyst. Other alternative words for ripener include fermenting agent, aging catalyst, or ripening enhancer. These words refer to different ways in which something is caused to mature or ripen, such as through natural processes or chemical reactions. The use of synonyms is an effective way to add depth and variety to language. By using different words to convey the same meaning, speakers and writers can create more interesting and nuanced expressions.