betterments is a form of:

Betterment



noun
1.
(a being made better, improvement) ការធ្វើឱ្យល្អឡើង, ការធ្វើឲ្យប្រសើរឡើង
ENGLISH MEANING
noun
1.
A making better; amendment; improvement.
2.
An improvement of an estate which renders it better than mere repairing would do; -- generally used in the plural.