The term is a subversive.
The word plutocracy means a government or society ruled by the rich.
Dictatorship or autocracy.
This was the original meaning of monarchy, which is now generally reserved for hereditary kings, queens, and emperors.
There is no one-word substitute in English for "son-in-law."
The word you want is florist.
Sportsmanship is a word substitute for spirit of game
The word metalworking is one word.
One possible substitute for "their" is "his" or "her" depending on the gender of the person/people being referred to. Another substitute can be "its" when referring to a non-human object or entity.
eat, use
The word that works is idiot.
dictator