Teacher is related to Pastor. Pastor is related to Minister. Minister is related to Church. Church is related to Sacred. 
Bill is related to Collection. Pile is a type of Collection. Pile is a type of Thread. Thread is related to Forum. 
Teacher <--RelatedTo--> Pastor <--RelatedTo--> Minister <--RelatedTo--> Church <--RelatedTo--> Sacred 
Bill <--RelatedTo--> Collection <--IsA-- Pile --IsA--> Thread <--RelatedTo--> Forum 