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Find the longest (English) word with no ascending characters, and the highest proportion of descending ones. A word's score is its length in characters multiplied by the descender proportion.
For example, "gray" is 4 * 50% = 2.
("Normal" Roman structure is assumed - like no descending "z"s, please.)
In the case of a tie, the word with the highest frequency (according to Kucera) wins.
BTW, the one I myself have so far scores 5 * 80% = 4.