There are several synonyms for the word "annotative" that can be used to describe something that is explanatory or descriptive. Some of these synonyms include informative, elucidative, interpretive, explicative, descriptive, and illustrative. An informative text or document provides information or insight into a topic, while an elucidative one clarifies or explains it. An interpretive work offers an interpretation of something, explicative materials explain it in detail, descriptive writings describe it in words, and illustrative material serves to clarify or explain it visually. All of these terms suggest that something is done to provide more information, context, or understanding to a given topic or subject.