Here's what rhymes with betterment.

Consider these alternatives

wellbeing / being democratisation / education humankind / kind prosperity / therapy mankind / kind aspiration / operation motherland / land democratization / education enjoyment / employment striving / driving strive / live uplift / published revitalization / relation revitalizing / rising freedoms / regions realization / relation amelioration / operation harmonious / erroneous humanitarianism / given rejuvenation / information evangelization / relation capitalistic / characteristic prioritizing / rising