Joint is a type of Cigarette. Cigarette can be used for Burn. Burn is related to Bridge. Bridge is related to Gate. 
Mate is etymologically related to Meat. Meat can be used for Eating. Eating can cause/lead to Gas. Gas is related to Carbon. 
Joint --IsA--> Cigarette --UsedFor--> Burn <--RelatedTo--> Bridge <--RelatedTo--> Gate 
Mate --EtymologicallyRelatedTo--> Meat --UsedFor--> Eating --Causes--> Gas <--RelatedTo--> Carbon 