* Education: This is the most general abstract noun for school, representing the process of learning and acquiring knowledge.
* Learning: This focuses on the act of gaining knowledge and skills.
* Instruction: This emphasizes the act of teaching and guiding.
* Institution: This refers to the physical building or organization that provides education.
* Curriculum: This represents the structured program of study offered by a school.
The best abstract noun will depend on the context and the specific meaning you want to convey.