Civilian is a type of Citizen. Citizen is derived from City. City is related to Camp. 
Feather can be used for Flight. Feather is related to Pillow. Pillow is a synonym of Rest. Rest is a synonym of Ease. 
Civilian --IsA--> Citizen --DerivedFrom--> City <--RelatedTo--> Camp 
Flight <--UsedFor-- Feather <--RelatedTo--> Pillow <--Synonym--> Rest <--Synonym--> Ease 