Mutual is a synonym of Common. Common is a different concept from Occasional. 
East is related to South. South is similar to West. West is a different concept from North. North is related to Magnetic. 
Mutual <--Synonym--> Common <--DistinctFrom--> Occasional 
East <--RelatedTo--> South <--SimilarTo--> West <--DistinctFrom--> North <--RelatedTo--> Magnetic 