Queen is a word that is used to denote a monarch or a sovereign of a dynasty. In earlier days, all countries had kings and queens, these countries were further divided in states, provinces, etc.
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In Hindi, there are many names that can be given to the word queen.
Some of them are:
The most common word that is used to denote the word queen in Hindi is रानी or महारानी. You can easily use the other words also but you will have to be careful about the pronunciation because the letter ज्ञ is pronounced differently in various parts of the country.