Epidemic is related to Disease. Disease is related to Condition. Condition is related to Diagnose. Diagnose is a type of Analyze. 
Dish is related to Cake. Cake is a different concept from Bread. 
Epidemic <--RelatedTo--> Disease <--RelatedTo--> Condition <--RelatedTo--> Diagnose --IsA--> Analyze 
Dish <--RelatedTo--> Cake <--DistinctFrom--> Bread 