✅ A messenger refers to a person who carries a message or communication (The messenger delivered the note quickly). 

✅ A courier is a person or service that transports messages, packages, or mail, often rapidly and securely (The courier service guaranteed next-day delivery). 

✅ Both words describe someone who delivers messages or goods. 

✅ Messenger is often used for simple message delivery, while courier implies a more professional or official service, often for transporting items securely (The king's messenger brought news from the battlefield; The courier delivered the documents safely).

✅ Destroy means to damage something so severely that it no longer exists or functions (The storm will destroy the old barn). 

✅ Annihilate implies complete destruction or obliteration, often to the point of non-existence (The army was annihilated by the enemy forces). 

✅ Both words describe the act of causing complete ruin. 

✅ Destroy can be used in everyday contexts to describe various levels of damage, while annihilate suggests a total and utter destruction (The kids accidentally destroyed the model plane; The asteroid could annihilate all life on Earth).

✅ Permanent means lasting or intended to last indefinitely without change (She got a permanent position at the company). 

✅ Indelible refers to something that cannot be removed, forgotten, or changed, often used metaphorically (The experience left an indelible mark on him). 

✅ Both words describe something that is lasting or unchangeable. 

✅ Permanent is used in a variety of contexts, from employment to markers, while indelible often implies a profound, lasting effect or impression (The artist's work will be featured in the museum's permanent collection; The indelible memory of their trip stayed with her).