The term SCHOOL PRIMER can be broken down into two crossword solutions: ABECEDARY (9 letters) and SPELLER (7 letters). An abecedary is an alphabet book, which is a type of primer used to teach children the basics of reading and writing. A speller is a book that teaches spelling, which is also a common component of a school primer. Therefore, the term SCHOOL PRIMER can be defined as a book used to teach the fundamentals of reading, writing, and spelling in a school setting.