Voice is related to Phone. Phone is related to Receiver. Receiver is a synonym of Recipient. 
Flame is related to Smoke. Sex would make you want to Smoke. Fucking is the Sex. 
Voice <--RelatedTo--> Phone <--RelatedTo--> Receiver <--Synonym--> Recipient 
Flame <--RelatedTo--> Smoke <--CausesDesire-- Sex <--DefinedAs-- Fucking 