Play is related to Joy. Joy is related to Wave. Wave is related to Hell. 
Uncertain is derived from Uncertainty. Uncertainty is a different concept from Sure. Sure is related to Servant. Servant is related to Kitchen. 
Play <--RelatedTo--> Joy <--RelatedTo--> Wave <--RelatedTo--> Hell 
Uncertain --DerivedFrom--> Uncertainty <--DistinctFrom--> Sure <--RelatedTo--> Servant <--RelatedTo--> Kitchen 