Identical is related to Equal. Equal is related to Artificial. Artificial is the opposite of Real. Real is similar to Proper. 
Controversial is derived from Controversy. Fight is a type of Controversy. Engage is a type of Fight. Engage is a type of Touch. 
Identical <--RelatedTo--> Equal <--RelatedTo--> Artificial <--Antonym--> Real <--SimilarTo--> Proper 
Controversial --DerivedFrom--> Controversy <--IsA-- Fight <--IsA-- Engage --IsA--> Touch 