This might be the question you are searching for-
"Who is a person who stands in for a sick or young ruler?"
The solution is -
The aptest word for a person who stands in for a young or sick ruler is Regent.
Words that can be used as a substitute for a larger description in order to make the sentence structure clearer are called one-word substitutes.
For example, we can use the one-word substitute 'posthumous' in order to avoid the longer meaning that is 'after the death of the individual.
Here, we needed the one-word substitute for a person who stands in for a sick or young ruler. Such a person is called a Regent. In a monarchy, a Regent stands in for such reasons or is either elected due to death or the end of the royal line.
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