There are several antonyms for the word "rack ruin." The opposite of destruction could be preservation, conservation, or protection. If we think of a rack as a support structure, the opposite could be a foundation or base. In terms of physical spaces, the antonyms of ruin might be improvement, restoration or renovation. If we consider the word "rack" as a verb indicating physical strain, then the antonyms could be relaxation, comfort or ease. Similarly, if we think of ruin as a state of disorder, the antonyms could be order, organization or cleanliness. All of these antonyms suggest a positive counterpoint to the negative connotations of "rack ruin.