Ranch can be used for Vacation. Ranch is related to Valley. Valley is a type of Stadium. Stadium is related to Arena. 
Electricity can be Dangerous. Dangerous is related to Harm. Harm is the opposite of Protect. 
Vacation <--UsedFor-- Ranch <--RelatedTo--> Valley --IsA--> Stadium <--RelatedTo--> Arena 
Electricity --HasProperty--> Dangerous <--RelatedTo--> Harm <--Antonym--> Protect 