Half moon is a term that denotes the shape of the moon, where its edge appears as a semicircle. There are a number of possible synonyms that might be used to describe this particular lunar phase, depending on the context and the audience. Some possible options include crescent moon, gibbous moon, waxing moon, or waning moon. Each of these terms carries with it a slightly different connotation, reflecting the changing appearance and phase of the moon as it revolves around the Earth. Whether used in scientific contexts or in more poetic or metaphorical language, these synonymic variations on the half moon offer a rich array of linguistic options for describing this celestial phenomenon.