✅ 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).

✅ Cost refers to the amount of money required to purchase something or the effort required to achieve something (The cost of the repairs was higher than expected). 

✅ Expenditure describes the act of spending money or resources, often in a business or government context (The government's expenditure on healthcare has increased). 

✅ Both terms relate to spending money or resources. 

✅ Cost is often used in everyday contexts to discuss prices, while expenditure is more formal, typically used in financial or official contexts (The cost of groceries has risen in the last few years; The annual expenditure was carefully audited).