Death knights are often associated with dark and grim concepts, and as such, there are several synonyms that can be used to describe them. Some of the most common synonyms for the term 'death knight' include dark knight, grim warrior, shadow warrior, undead knight, and shadow knight. These synonyms evoke notions of horror, death, and the unknown, and are often used to describe fictional or mythological characters that are considered to be powerful and intimidating. While each of these synonyms may have a slightly different connotation, they all share the common thread of being associated with darkness and death, making them perfect choices for those seeking to create a menacing and spooky atmosphere.