Appetite Arouser is a term used to describe something that stimulates the appetite. The crossword solutions for this term are AROMA (5 letters), AROMAS (6 letters), and MOON (4 letters). AROMA and AROMAS refer to the scent of food, which can be used to stimulate the appetite. MOON is likely referring to the phrase 'once in a blue MOON, ' which is used to describe something that happens rarely, such as a special meal that is only served occasionally. All three of these words can be used to describe something that arouses the appetite.