Item is related to Rock. Rock is related to Dirt. Dirt is related to Road. Road is related to Formal. 
Boat is related to Chief. Chief is related to Middle. Middle is a synonym of Midst. 
Item <--RelatedTo--> Rock <--RelatedTo--> Dirt <--RelatedTo--> Road <--RelatedTo--> Formal 
Boat <--RelatedTo--> Chief <--RelatedTo--> Middle <--Synonym--> Midst 