Cheek is related to Wear. Wear is related to Sock. Sock is the opposite of Shoe. 
Old is related to Gray. Aluminum is a type of Gray. Aluminum is related to Silver. Silver is a type of Color. 
Cheek <--RelatedTo--> Wear <--RelatedTo--> Sock <--Antonym--> Shoe 
Old <--RelatedTo--> Gray <--IsA-- Aluminum <--RelatedTo--> Silver --IsA--> Color 