Executive is related to Employee. Employee is the opposite of Boss. Boss is the opposite of Worker. 
People can be Sick. Sick is the opposite of Normal. Normal is a synonym of Conventional. Conventional is derived from Convention. 
Executive <--RelatedTo--> Employee <--Antonym--> Boss <--Antonym--> Worker 
People --HasProperty--> Sick <--Antonym--> Normal <--Synonym--> Conventional --DerivedFrom--> Convention 