WebSynonyms: 太陰 (taiin), ムーン (mūn) ( astronomy) a natural satellite. moonlight, moonbeam. Synonyms: 月光 (gekkō), 月影 (tsukikage) a 家紋 (kamon, “ family crest ”) with various designs of the moon. ( tarot) the Moon, the eighteenth trump or major arcana card in most traditional Tarot decks. a month.