Sector is a synonym of Sphere. Sphere is related to Round. 
Bike is related to Grip. Grip is related to Rubber. Rubber is related to Duck. Duck is related to Dog. 
Sector <--Synonym--> Sphere <--RelatedTo--> Round 
Bike <--RelatedTo--> Grip <--RelatedTo--> Rubber <--RelatedTo--> Duck <--RelatedTo--> Dog 