Shirt is related to Button. Button is etymologically related to Butt. Butt is etymologically related to Beat. 
Race is a type of Compete. Race is related to Driver. Driver is related to Wheel. Gear is a type of Wheel. 
Shirt <--RelatedTo--> Button --EtymologicallyRelatedTo--> Butt --EtymologicallyRelatedTo--> Beat 
Compete <--IsA-- Race <--RelatedTo--> Driver <--RelatedTo--> Wheel <--IsA-- Gear 