Roman is related to Column. Column is related to Metal. Metal is related to Bronze. Bronze is related to Medal. 
Psychologist is derived from Psychology. Psychologist is related to Therapy. 
Roman <--RelatedTo--> Column <--RelatedTo--> Metal <--RelatedTo--> Bronze <--RelatedTo--> Medal 
Psychology <--DerivedFrom-- Psychologist <--RelatedTo--> Therapy 