Bother is related to Worry. Worried is a form of Worry. 
Sole is etymologically related to Save. Sole is a type of Area. Area is related to Site. River is a type of Site. 
Bother <--RelatedTo--> Worry <--FormOf-- Worried 
Save <--EtymologicallyRelatedTo-- Sole --IsA--> Area <--RelatedTo--> Site <--IsA-- River 