Pack is a type of Arrange. Arrange is etymologically related to Ring. Ring is related to Present. Present is the opposite of History. 
Accident is a synonym of Casualty. Casualty is a synonym of Disaster. Disaster is a type of Emergency. Emergency is related to Hospital. 
Pack --IsA--> Arrange --EtymologicallyRelatedTo--> Ring <--RelatedTo--> Present <--Antonym--> History 
Accident <--Synonym--> Casualty <--Synonym--> Disaster --IsA--> Emergency <--RelatedTo--> Hospital 