Common is related to Regular. Regular is the opposite of Secular. 
Event is a synonym of Phenomenon. Phenomenon is related to Sound. Sound is a type of Channel. Channel is a synonym of Passage. 
Common <--RelatedTo--> Regular <--Antonym--> Secular 
Event <--Synonym--> Phenomenon <--RelatedTo--> Sound --IsA--> Channel <--Synonym--> Passage 