Leader is related to Executive. Ceo is derived from Executive. 
Responsible is a synonym of Own. Own is related to Possess. Possess is the opposite of Give. Give is related to Trade. 
Leader <--RelatedTo--> Executive <--DerivedFrom-- Ceo 
Responsible <--Synonym--> Own <--RelatedTo--> Possess <--Antonym--> Give <--RelatedTo--> Trade 