Approval is a type of Message. Message is a synonym of Notice. Notice is a synonym of Acknowledge. Acknowledge is derived from Knowledge. 
Challenge is a synonym of Test. Test is related to Driving. Driving is related to Vehicle. Glass is a type of Vehicle. 
Approval --IsA--> Message <--Synonym--> Notice <--Synonym--> Acknowledge --DerivedFrom--> Knowledge 
Challenge <--Synonym--> Test <--RelatedTo--> Driving <--RelatedTo--> Vehicle <--IsA-- Glass 