Sea is related to Calm. Calm is related to Peace. Peace is a different concept from Conflict. 
Cross is related to Piece. Piece is related to Sheet. Sheet is a synonym of Layer. 
Sea <--RelatedTo--> Calm <--RelatedTo--> Peace <--DistinctFrom--> Conflict 
Cross <--RelatedTo--> Piece <--RelatedTo--> Sheet <--Synonym--> Layer 