Relieve is a synonym of Rest. Rest is related to Chill. Chill is related to Cold. Cold is the opposite of Steam. 
Exit is a type of Opening. Opening is a type of Motion. 
Relieve <--Synonym--> Rest <--RelatedTo--> Chill <--RelatedTo--> Cold <--Antonym--> Steam 
Exit --IsA--> Opening --IsA--> Motion 