Shelter is etymologically related to Trim. Shelter is a type of Structure. 
Departure is derived from Depart. Departure is the opposite of Entry. Entry is a synonym of Admission. Admission is related to Ticket. 
Trim <--EtymologicallyRelatedTo-- Shelter --IsA--> Structure 
Depart <--DerivedFrom-- Departure <--Antonym--> Entry <--Synonym--> Admission <--RelatedTo--> Ticket 