The term 'Flavour Enhancer' can be broken down into two crossword solutions: CONDIMENT (9 letters) and ADDITIVE (8 letters). A CONDIMENT is a type of food or seasoning that is added to dishes to enhance the flavour. Common examples include ketchup, mustard, and mayonnaise. An ADDITIVE is a substance that is added to food to improve its taste, texture, or shelf life. Common examples include salt, sugar, and monosodium glutamate (MSG). Both condiments and additives are used to enhance the flavour of food.