The term "Sea drake" refers to a mythical creature that roams the depths of the sea. While this term is commonly used, there are several synonyms that can be used interchangeably. One alternative is "Marine serpent", which portrays a similar image of a serpent-like creature dwelling in the sea. Another synonym is "Oceanic wyvern", which adds a touch of fantasy to the description. Additionally, "Seafarer's dragon" evokes a sense of adventure and exploration. Lastly, "Abyssal leviathan" describes a formidable sea monster that commands awe and fear. These synonyms offer various perspectives on the mythical sea creature and can be used to diversify one's vocabulary.