Partner is a type of Supply. Partner is related to Friend. Friend is the opposite of Stranger. you are likely to find Stranger in/at/on Traffic. 
Unit is related to Department. Department is related to Organization. Organization is related to Professional. 
Supply <--IsA-- Partner <--RelatedTo--> Friend <--Antonym--> Stranger --AtLocation--> Traffic 
Unit <--RelatedTo--> Department <--RelatedTo--> Organization <--RelatedTo--> Professional 