Physics is related to Body. Body is related to Knee. 
Vehicle is related to Bus. Bus is a synonym of Coach. Coach is related to Guidance. Guidance is a synonym of Counseling. 
Physics <--RelatedTo--> Body <--RelatedTo--> Knee 
Vehicle <--RelatedTo--> Bus <--Synonym--> Coach <--RelatedTo--> Guidance <--Synonym--> Counseling 