Nonagenarian. Its has four N's in it.
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Brain, Train, Drain, ..... then I got stuck (cos Tannin has two ns) Go here for a more comprehensive list: http://www.crosswordsolver.org/quicksolve.php?action=search&letters=5&word[1]=&word[2]=&word[3]=&word[4]=I&word[5]=N
Mirror has three rs and its a 6 letter word. so it has the most percentage of R's. Is that what you mean?
Whitefish LakeWindy LakeWhite Lake (ON)Whites Lake (NS)
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