The word "Apostil" has several synonyms that can be used interchangeably based on the context. Some of these synonyms include annotation, addendum, postscript, footnote, notation, and comment. These words are typically used to refer to additional information or comments made on a text after it has been written. They can also be used to add clarification or emphasis to particular points in a text. In legal circles, an "Apostil" is a certification or authentication of a document, and synonyms for it include seal, stamp, certification, and verification. It's essential to choose the right synonym that fits the context when using any of these words to prevent confusion and ambiguity in communication.