Coeus is a Greek word that refers to a titan in Greek mythology who was the god of intellect and the axis of heaven. Though it isn't commonly used in everyday language, there are several synonyms that can be used in its place. For example, words like genius, intellect, and thinker can be used instead of coeus to describe a person who possesses a high level of intelligence. Similarly, words like philosopher, sage, and scholar can be used to describe a person who is knowledgeable and wise. Other possible synonyms include sage, prodigy, or luminary, depending on the context in which the word is being used.