Complete is the opposite of Piece. Piece is related to Chunk. Chunk is a synonym of Ball. Ball is related to Beach. 
Give is the opposite of Pick. Pick is related to Pepper. 
Complete <--Antonym--> Piece <--RelatedTo--> Chunk <--Synonym--> Ball <--RelatedTo--> Beach 
Give <--Antonym--> Pick <--RelatedTo--> Pepper 