Later is the opposite of Current. Current is related to Newspaper. Newspaper is a type of Document. Document is related to Contract. 
Dimension is related to Point. Point is the opposite of Flat. Flat is related to Forehead. Forehead is the opposite of Chin. 
Later <--Antonym--> Current <--RelatedTo--> Newspaper --IsA--> Document <--RelatedTo--> Contract 
Dimension <--RelatedTo--> Point <--Antonym--> Flat <--RelatedTo--> Forehead <--Antonym--> Chin 