Odour and smell(as a noun) are similar. They are anything that you can smell - good or bad, but more commonly not so pleasant. Odour would probably be used for a smell that isn't as strong. A perfume is usually a strong, pleasant smell, and is usually manufactured. Fragrance and scent are usually a bit less strong than a perfume, but are a similar idea. Sweet is a very general word, and is an adjective. When used with smells, it means pleasant and not too strong.

What are the differences.. ;^p

sorry,,,what is the differences.....