Jotunn is a word in Norse mythology that referred to the giants who lived in Jotunheim, one of the Nine Worlds. However, there are several synonyms for the word "jotunn" that can be used interchangeably. Some of these synonyms include ettin, giant, troll, and ogre. Ettin is also a Norse term that referred to the giants, while giant is a more common English word that denotes a huge creature. Troll is another type of mythical creature that is often depicted as giant and mischievous, while ogre is a term that denotes a monstrous humanoid with ugly features. These synonyms for "jotunn" can be used in various contexts to refer to beings of great size and strength.