Flag is related to Fabric. Fabric is related to Patch. 
Field is a synonym of Ground. Ground is the opposite of Roof. you are likely to find Towel in/at/on Roof. you are likely to find Towel in/at/on Closet. 
Flag <--RelatedTo--> Fabric <--RelatedTo--> Patch 
Field <--Synonym--> Ground <--Antonym--> Roof <--AtLocation-- Towel --AtLocation--> Closet 