Cart is a type of Wagon. Cart is similar to Automobile. Engine is part of Automobile. 
One is related to Regret. Regret is related to Unhappy. Unhappy is a synonym of Depressed. Depressed is the opposite of Glad. 
Wagon <--IsA-- Cart <--SimilarTo--> Automobile <--PartOf-- Engine 
One <--RelatedTo--> Regret <--RelatedTo--> Unhappy <--Synonym--> Depressed <--Antonym--> Glad 