Republican is related to Party. Party is related to Bar. Bar is related to Adult. 
Slope is related to Road. Railroad is etymologically related to Road. Railroad is derived from Rail. 
Republican <--RelatedTo--> Party <--RelatedTo--> Bar <--RelatedTo--> Adult 
Slope <--RelatedTo--> Road <--EtymologicallyRelatedTo-- Railroad --DerivedFrom--> Rail 