Song is related to Round. Round is related to Roll. 
Soar is related to Rocket. Rocket is related to Fast. Fast is similar to Express. Express is related to Driving. 
Song <--RelatedTo--> Round <--RelatedTo--> Roll 
Soar <--RelatedTo--> Rocket <--RelatedTo--> Fast <--SimilarTo--> Express <--RelatedTo--> Driving 