Beach is related to Ball. Ball is a synonym of Chunk. Chunk is related to Piece. Piece is the opposite of Complete. 
Visible is the opposite of Hidden. Hidden is a synonym of Invisible. 
Beach <--RelatedTo--> Ball <--Synonym--> Chunk <--RelatedTo--> Piece <--Antonym--> Complete 
Visible <--Antonym--> Hidden <--Synonym--> Invisible 