adjective

Best, when used as an adjective, means to be of the highest or most excellent quality or to be the most suitable or desirable.

adverb

Best as an adverb means "in the most excellent way, most effectively, or most satisfactorily."

noun

The best as a noun means "the most excellent, outstanding, or desirable one of a group or category".

 

Example

adjective

1. He is the best student in the class.
2. She cooked the best meal I have ever tasted.
3. That was the best decision he ever made.

adverb

1. He did his best to finish the project.
2. She sang her song the best she could.
3. He presented the results in the best way possible.

noun

1. I believe that this is the best option.
2. The best way to solve this problem is to think outside the box.
3. His best quality is that he is always willing to help others.