Known is the opposite of Guess. Guess is related to Action. 
Valuable is a type of Treasure. Fortune is a type of Treasure. Fortune is related to Wealth. Wealth is related to Earn. 
Known <--Antonym--> Guess <--RelatedTo--> Action 
Valuable --IsA--> Treasure <--IsA-- Fortune <--RelatedTo--> Wealth <--RelatedTo--> Earn 