Joint is a synonym of Unite. United is a form of Unite. United is related to Kingdom. 
Fold is a type of Structure. Fold is the opposite of Unfold. Unfold is a synonym of Spread. Spread is a synonym of Mushroom. 
Joint <--Synonym--> Unite <--FormOf-- United <--RelatedTo--> Kingdom 
Structure <--IsA-- Fold <--Antonym--> Unfold <--Synonym--> Spread <--Synonym--> Mushroom 