North is a different concept from East. East is the opposite of West. 
Convince is a synonym of Assure. Assure is a synonym of Cheer. Cheer is related to Happy. Happy is the opposite of Birthday. 
North <--DistinctFrom--> East <--Antonym--> West 
Convince <--Synonym--> Assure <--Synonym--> Cheer <--RelatedTo--> Happy <--Antonym--> Birthday 