Tool is a synonym of Use. Useful is derived from Use. Useful is related to Product. Product is related to Pork. 
Desert is a type of Place. Desert is related to Lonely. 
Tool <--Synonym--> Use <--DerivedFrom-- Useful <--RelatedTo--> Product <--RelatedTo--> Pork 
Place <--IsA-- Desert <--RelatedTo--> Lonely 