S: (v) enrich (make better or improve in quality) "The experience enriched her understanding"; "enriched foods"
S: (v) build up, develop (change the use of and make available or usable) "develop land"; "The country developed its natural resources"; "The remote areas of the country were gradually built up"
S: (v) turn around (improve dramatically) "The new strategy turned around sales"; "The tutor turned around my son's performance in math"
S: (v) help (improve; change for the better) "New slipcovers will help the old living room furniture"
S: (v) upgrade (to improve what was old or outdated) "I've upgraded my computer so I can run better software"; "The company upgraded their personnel"
S: (v) condition (put into a better state) "he conditions old cars"
S: (v) emend (make improvements or corrections to) "the text was emended in the second edition"
S: (v) iron out, straighten out, put right (settle or put right) "we need to iron out our disagreements"
S: (v) enhance (make better or more attractive) "This sauce will enhance the flavor of the meat"
S: (v) purify, sublimate, make pure, distill (remove impurities from, increase the concentration of, and separate through the process of distillation) "purify the water"
S: (v) fructify (make productive or fruitful) "The earth that he fructified"
W: (n) betterment [Related to: better] (the act of relieving ills and changing for the better)
W: (n) better [Related to: better] (the superior one of two alternatives) "chose the better of the two"
W: (n) improvement [Related to: improve] (the act of improving something) "their improvements increased the value of the property"
W: (n) improver [Related to: improve] (someone devoted to the promotion of human welfare and to social reforms)
W: (n) improver [Related to: improve] (a component that is added to something to improve it) "the addition of a bathroom was a major improvement"; "the addition of cinnamon improved the flavor"
W: (adj) amendable [Related to: amend] (capable of being corrected by additions) "an amendable flaw"
S: (v) disentangle, unsnarl, straighten out (extricate from entanglement) "Can you disentangle the cord?"
S: (v) reform, straighten out, see the light (change for the better) "The lazy student promised to reform"; "the habitual cheater finally saw the light"