Speak is a type of Sound. Sound is related to Energy. Energy is a different concept from Tire. Tire is a type of Wheel. 
Service is a type of Employment. Employment can cause/lead to Depression. Depression is related to Sad. Sad is related to Hurt. 
Speak --IsA--> Sound <--RelatedTo--> Energy <--DistinctFrom--> Tire --IsA--> Wheel 
Service --IsA--> Employment --Causes--> Depression <--RelatedTo--> Sad <--RelatedTo--> Hurt 