Staff is a synonym of Crew. Crew is a type of Unit. Company is a type of Unit. Company is a synonym of Accompany. 
you are likely to find Fork in/at/on Salad. Salad is related to Plate. 
Staff <--Synonym--> Crew --IsA--> Unit <--IsA-- Company <--Synonym--> Accompany 
Fork --AtLocation--> Salad <--RelatedTo--> Plate 