Refuge is a synonym of Safety. Safety is the opposite of Dangerous. 
Atmosphere is derived from Sphere. Atmosphere is related to Layer. Layer is related to Cover. Straw is a type of Cover. 
Refuge <--Synonym--> Safety <--Antonym--> Dangerous 
Sphere <--DerivedFrom-- Atmosphere <--RelatedTo--> Layer <--RelatedTo--> Cover <--IsA-- Straw 