Instructor is related to Teacher. Teacher is a synonym of Index. Index is a type of List. 
Trade is related to Activity. Activity is related to Smell. Smell is a different concept from Hearing. 
Instructor <--RelatedTo--> Teacher <--Synonym--> Index --IsA--> List 
Trade <--RelatedTo--> Activity <--RelatedTo--> Smell <--DistinctFrom--> Hearing 