Successful is related to Profit. Profit is related to Revenue. 
Will is related to Slope. Slope is related to Road. Road is related to Rough. Rough is the opposite of Gentle. 
Successful <--RelatedTo--> Profit <--RelatedTo--> Revenue 
Will <--RelatedTo--> Slope <--RelatedTo--> Road <--RelatedTo--> Rough <--Antonym--> Gentle 