Concern is a type of Sympathy. Sympathy is a type of Emotion. Emotion is related to Scream. Scream is the opposite of Remain. 
Difference is related to Distinguish. 
Concern --IsA--> Sympathy --IsA--> Emotion <--RelatedTo--> Scream <--Antonym--> Remain 
Difference <--RelatedTo--> Distinguish 