Mechanic is related to Doctor. Doctor is related to Profession. Pilot is a type of Profession. Pilot is related to Drive. 
Open is a synonym of Clear. Clear is related to Visible. Visible is a different concept from Invisible. Invisible is a different concept from Apparent. 
Mechanic <--RelatedTo--> Doctor <--RelatedTo--> Profession <--IsA-- Pilot <--RelatedTo--> Drive 
Open <--Synonym--> Clear <--RelatedTo--> Visible <--DistinctFrom--> Invisible <--DistinctFrom--> Apparent 