YLL is a measure of "years of life lost", an estimate of the average years a person would have lived, had he or she not died prematurely.
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A shipboard romance would be called idyll.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern --YLL--TS. That is, nine letter words with 3rd letter Y and 4th letter L and 5th letter L and 8th letter T and 9th letter S. In alphabetical order, they are: idyllists