Powerful is related to Motor. Motor is a synonym of Automobile. Automobile is a synonym of Car. Car is related to Ride. 
Famous is the opposite of Personality. Personality is related to Person. Person can be used for Labor. Slave can be used for Labor. 
Powerful <--RelatedTo--> Motor <--Synonym--> Automobile <--Synonym--> Car <--RelatedTo--> Ride 
Famous <--Antonym--> Personality <--RelatedTo--> Person --UsedFor--> Labor <--UsedFor-- Slave 