Meal is a synonym of Board. Board is related to Risk. Risk is related to Challenge. 
Purpose is related to Aim. Aim is a synonym of End. End is related to Conclusion. 
Meal <--Synonym--> Board <--RelatedTo--> Risk <--RelatedTo--> Challenge 
Purpose <--RelatedTo--> Aim <--Synonym--> End <--RelatedTo--> Conclusion 