Cage is a type of Constraint. Cage is the opposite of Nest. Nest is related to Live. 
Action is a synonym of Turn. Turn is related to Necessity. Necessity is related to Necessary. Necessary is similar to Inevitable. 
Constraint <--IsA-- Cage <--Antonym--> Nest <--RelatedTo--> Live 
Action <--Synonym--> Turn <--RelatedTo--> Necessity <--RelatedTo--> Necessary <--SimilarTo--> Inevitable 