Dependent is derived from Depend. Depend is related to Adult. Professional is a type of Adult. Engineer is a type of Professional. 
Bay is related to Doll. Doll is the opposite of Truck. Truck is related to Trailer. 
Dependent --DerivedFrom--> Depend <--RelatedTo--> Adult <--IsA-- Professional <--IsA-- Engineer 
Bay <--RelatedTo--> Doll <--Antonym--> Truck <--RelatedTo--> Trailer 