Layer is a type of Region. Layer is related to Cover. Bury entails/necessarily involves Cover. 
Sorry is a synonym of Sad. Sad is related to Feeling. Success can be used for Feeling. Passing is a type of Success. 
Region <--IsA-- Layer <--RelatedTo--> Cover <--Entails-- Bury 
Sorry <--Synonym--> Sad <--RelatedTo--> Feeling <--UsedFor-- Success <--IsA-- Passing 