Reform
Yes, the word 'improvement' is an idea noun (an abstract noun) a word for a change for the better; progress in development; a word for a concept.
Yes, the word 'improvement' is a noun; a singular, common, abstract noun; a word for a change for the better; progress in development; a word for a concept; a word for a thing.
Yes, the noun improvement is an abstract noun, a word a change for the better; progress in development; a word for a concept.
2 words that describes the change to something to make it better would be "improvement" or "improving" or 'to enhance '
Yes, the noun 'improvement' is an abstract noun; a word for the process of making something better than it was before; a change made to something in order to make it better; a word for a concept.
Reform
Possibilities are amend or improve.
"Baffled" means confronted by a situation that needs improvement but unable to imagine how to achieve the improvement needed.
Made better in some way.
The word you are looking for is "rehabilitate." It means to restore to a better condition or improve.
Answersuperior, better, improved, amended, ameliorated, meliorated
The word root that means change is "morph."