Sentence:  I am afraid that some of the nobles who are campaigning for it simply want to use the <WSD>Estates</WSD> to cut down the King's power and increase their own. 
Meaning of the word marked with <WSD> tags:  A major social class or order of persons regarded collectively as part of the body politic of the country and formerly possessing distinct political rights ((Estates of the realm)). (from 14thc.)