Clinical is derived from Clinic. Clinical is similar to Objective. Objective is a type of Lens. Lens is related to Focus. 
Actor is a type of Artist. Actor is a synonym of Plaintiff. Plaintiff is the opposite of Defendant. 
Clinic <--DerivedFrom-- Clinical <--SimilarTo--> Objective --IsA--> Lens <--RelatedTo--> Focus 
Artist <--IsA-- Actor <--Synonym--> Plaintiff <--Antonym--> Defendant 