Sweet is related to Fruit. Fruit is related to Seed. Pit is a type of Seed. 
Traffic can be Smooth. Traffic is related to Road. Road is related to Post. 
Sweet <--RelatedTo--> Fruit <--RelatedTo--> Seed <--IsA-- Pit 
Smooth <--HasProperty-- Traffic <--RelatedTo--> Road <--RelatedTo--> Post 