Amend
Part of speech: verb
Definition: To make better. To become better. To make a formal alteration in legislation by adding, deleting, or rephrasing.
Example sentence: MPs should be able to debate, amend and approve a mandate for the negotiation of any trade agreement before talks start, based on an independent impact assessment of what social, economic and environmental risks might be expected.
Improve
Part of speech: verb
Definition: to make (something) better; to increase the value or productivity (of something)to become better
Example sentence: The only way forward, if we are going to improve the quality of the environment, is to get everybody involved.