Candle is related to Heat. Heat is related to Radiation. 
River is the opposite of Sea. Sea is related to Vast. Vast is related to Ocean. Ocean is related to Swell. 
Candle <--RelatedTo--> Heat <--RelatedTo--> Radiation 
River <--Antonym--> Sea <--RelatedTo--> Vast <--RelatedTo--> Ocean <--RelatedTo--> Swell 