Busy is a type of Work. Busy is related to Rush. 
Coast is related to Place. Place is related to File. File is related to Pile. Pile is a type of Illness. 
Work <--IsA-- Busy <--RelatedTo--> Rush 
Coast <--RelatedTo--> Place <--RelatedTo--> File <--RelatedTo--> Pile --IsA--> Illness 