Silence is the opposite of Voice. Voice is related to Phone. Phone is related to Communication. Rhetoric is a type of Communication. 
Ring is related to Telephone. Telephone is related to Cable. 
Silence <--Antonym--> Voice <--RelatedTo--> Phone <--RelatedTo--> Communication <--IsA-- Rhetoric 
Ring <--RelatedTo--> Telephone <--RelatedTo--> Cable 