Yield is a synonym of Fold. Cross is a type of Fold. Cross is related to Symbolic. 
Grass is related to Cover. Cover is a synonym of Top. Top is a synonym of Exceed. 
Yield <--Synonym--> Fold <--IsA-- Cross <--RelatedTo--> Symbolic 
Grass <--RelatedTo--> Cover <--Synonym--> Top <--Synonym--> Exceed 