Risk is a type of Try. Risk is related to World. World is related to Web. Web is related to Nest. 
Contribute is a synonym of Bring. Tube is a type of Bring. Barrel is a type of Tube. 
Try <--IsA-- Risk <--RelatedTo--> World <--RelatedTo--> Web <--RelatedTo--> Nest 
Contribute <--Synonym--> Bring <--IsA-- Tube <--IsA-- Barrel 