Sure, there is only one word with 4 letters that is “mest” and it means “most”. It is an adjective that is used to compare two or more things. It is the superlative form of “much” or “many”.
For example,
- I have the most money in the class.
- She is the most intelligent person I know.
- This is the most delicious cake I have ever tasted.
The word “mest” is not commonly used in English. It is more common to use the word “most”. However, the word “mest” can be used in poetry and literature.