Attack is related to Offensive. Offensive is a synonym of Aggressive. Aggressive is related to Hostile. Hostile is similar to Ill. 
Assignment is a synonym of Appointment. Appointment is a synonym of Direction. Southwest is a type of Direction. 
Attack <--RelatedTo--> Offensive <--Synonym--> Aggressive <--RelatedTo--> Hostile <--SimilarTo--> Ill 
Assignment <--Synonym--> Appointment <--Synonym--> Direction <--IsA-- Southwest 