When it comes to referring to a child who is currently attending school, there are several synonyms that you can use instead of the word "schoolkid." These include terms such as student, pupil, learner, scholar, and attendee. You could also use descriptive terms such as young scholar, education-seeker, or school-goer. These synonyms can help to add variety to your writing and make it sound more sophisticated. Additionally, depending on the context, you could use terms such as kindergartener, elementary schooler, middle schooler, high schooler, or college student to be more specific about the child's age and level of education.