Coign of vantage is a phrase that typically refers to a position of advantage or a strategic location from where a person can observe things. However, there are several synonyms for this phrase that can be used to convey a similar message. Some of these words include "advantage point," "bird's-eye view," "commanding position," "strategic spot," "high ground," "elevated position," "viewpoint," and "observation point." Each of these words can be effectively used in different contexts to replace the phrase "coign of vantage," depending on the subject or situation that is being described. By using these synonyms, a writer or speaker can add variety and clarity to their speech or writing while conveying the same meaning.