Bone is related to Unit. Unit is related to Current. 
Thing is a synonym of Stuff. Stuff is related to Clothes. Clothes is related to Fabric. Fiber is a type of Fabric. 
Bone <--RelatedTo--> Unit <--RelatedTo--> Current 
Thing <--Synonym--> Stuff <--RelatedTo--> Clothes <--RelatedTo--> Fabric <--IsA-- Fiber 