Communicate is a synonym of Afford. Afford is related to Budget. Budget is related to Monthly. Monthly is related to Mortgage. 
Go is the opposite of Arise. Arise is the opposite of Lower. 
Communicate <--Synonym--> Afford <--RelatedTo--> Budget <--RelatedTo--> Monthly <--RelatedTo--> Mortgage 
Go <--Antonym--> Arise <--Antonym--> Lower 