Psychologist is derived from Psychology. Psychology is related to Social. Social is related to Law. Law is related to Practice. 
Cooperative is a type of Association. League is a type of Association. League is a type of Union. Union is the opposite of Division. 
Psychologist --DerivedFrom--> Psychology <--RelatedTo--> Social <--RelatedTo--> Law <--RelatedTo--> Practice 
Cooperative --IsA--> Association <--IsA-- League --IsA--> Union <--Antonym--> Division 