Words that mean to change for the better include "improve," "enhance," "upgrade," "develop," and "progress." These words imply a positive transformation or advancement in a particular aspect or situation.
better myself
Words with the same meaning:alter
to become better/worse than you were
2 words that describes the change to something to make it better would be "improvement" or "improving" or 'to enhance '
have better posture... so your balance is better and the horse will respond better this change
Change
Better from your dictionary, but generally a change between two states, or an agent to accomplish such a change.
it decribes one or more words in a sentance that decribe the word or words more better
if you mean 'amend' it is a change for the better, an improvement or a corrective procedure
better out than in and if you mean eating it then you need to change your diet
Aerodynamic efficiency would be one reason. Also can be they change them just as a design change, in other words to better blend with the styling of the body. Or they can be change to provide better rear visibility.
I'm not really mean but when words change form...... it's like, read (present form) and read (past form) is that what you mean? if not you can always go to Google!!!
I couldn't think of many so here is one : better