There are a plethora of synonyms for the word "teachier." Some of the most common ones include pedantic, didactic, instructive, edifying, informative, enlightening, educational, and informative. These words all relate to education or the process of imparting knowledge to others. In some cases, they can have a negative connotation, such as when someone is called pedantic, which implies that they are overly focused on details and rules. However, in other contexts, these synonyms can be very positive, such as when someone is called informative or enlightening, which suggests that they are able to share valuable knowledge and wisdom with others. Ultimately, the synonym that is most appropriate for "teachier" will depend on the context and the intended audience.