General:
* Emotion: A feeling or state of mind.
* Experience: The process of living through something.
* Effort: The energy or work put into something.
* Excitement: A feeling of eagerness and anticipation.
* Empathy: The ability to understand and share the feelings of another.
* Energy: The ability to do work.
* Equality: The state of being equal.
* Enthusiasm: A strong feeling of excitement and interest.
* Excellence: The state of being exceptionally good.
* Eternity: Timelessness or infinite duration.
More specific:
* Education: The process of learning.
* Entertainment: The act of providing amusement.
* Envy: A feeling of resentment towards someone who has something you want.
* Eviction: The act of forcing someone to leave a property.
* Expectation: A belief that something will happen.
* Explanation: A statement that makes something clear.
* Extinction: The state of no longer existing.
* Elegance: Graceful beauty and refinement.
* Erudition: Deep knowledge and learning.
* Evangelism: The act of spreading religious beliefs.
This is just a sample, and there are many other abstract nouns starting with "E." You can find more by thinking about different concepts and ideas, and then asking yourself if they represent things you can touch or hold (concrete nouns) or if they represent concepts, qualities, or feelings (abstract nouns).