Boundary is a synonym of Edge. Edge is the opposite of Interior. Interior is similar to Internal. 
Garden is related to Private. Private is related to Property. Property is related to Claim. Claim is related to Statement. 
Boundary <--Synonym--> Edge <--Antonym--> Interior <--SimilarTo--> Internal 
Garden <--RelatedTo--> Private <--RelatedTo--> Property <--RelatedTo--> Claim <--RelatedTo--> Statement 