Grave is related to People. People wants (to) Compete. Competitor is derived from Compete. 
Communicate is a synonym of Afford. Afford is related to Budget. Budget is related to Monthly. Monthly is related to Mortgage. 
Grave <--RelatedTo--> People --Desires--> Compete <--DerivedFrom-- Competitor 
Communicate <--Synonym--> Afford <--RelatedTo--> Budget <--RelatedTo--> Monthly <--RelatedTo--> Mortgage 