Isolation is a type of Separation. Isolation is the opposite of Context. Context is related to Nation. 
Sound is related to Definition. Line can be used for Definition. Line is a type of Fill. Fill is related to Station. 
Separation <--IsA-- Isolation <--Antonym--> Context <--RelatedTo--> Nation 
Sound <--RelatedTo--> Definition <--UsedFor-- Line --IsA--> Fill <--RelatedTo--> Station 