Bond is a synonym of Bind. Bind is related to Book. Stranger is a type of Book. you are likely to find Stranger in/at/on Crowd. 
Nurse is a different concept from Doctor. Doctor is a type of Professional. Technician is a type of Professional. 
Bond <--Synonym--> Bind <--RelatedTo--> Book <--IsA-- Stranger --AtLocation--> Crowd 
Nurse <--DistinctFrom--> Doctor --IsA--> Professional <--IsA-- Technician 