Wheel is related to Car. Car is related to Mobile. Mobile is the opposite of Stable. 
Wall is related to Vertical. Vertical is a synonym of Sheer. Sheer is related to Drop. Drop is related to Pick. 
Wheel <--RelatedTo--> Car <--RelatedTo--> Mobile <--Antonym--> Stable 
Wall <--RelatedTo--> Vertical <--Synonym--> Sheer <--RelatedTo--> Drop <--RelatedTo--> Pick 