Sound is a different concept from Vision. Survey is etymologically related to Vision. Surveillance is derived from Survey. 
Guard is related to National. National is a different concept from Local. Local is related to Council. 
Sound <--DistinctFrom--> Vision <--EtymologicallyRelatedTo-- Survey <--DerivedFrom-- Surveillance 
Guard <--RelatedTo--> National <--DistinctFrom--> Local <--RelatedTo--> Council 