When it comes to 5-letter words, certain letters are used more frequently than others. In the English language, there are 26 letters in the alphabet, but not all of them are used with the same frequency. Some letters are more commonly used than others, and this can have an impact on the letters that appear most frequently in 5-letter words.

One of the best ways to determine the most frequently used letters in 5-letter words is to look at data from large sets of words. One such dataset is the Corpus of Contemporary American English (COCA), which contains over 520 million words from a wide variety of sources. By analyzing this dataset, we can get a good sense of which letters are used most frequently in 5-letter words.
According to the COCA, the most frequently used letter in 5-letter words is E, which appears in approximately 11.16% of all 5-letter words. This is followed by A, which appears in approximately 8.17% of all 5-letter words, and I, which appears in approximately 7.28% of all 5-letter words.
The next most frequently used letters in 5-letter words are O and S, which appear in approximately 6.09% and 6.05% of all 5-letter words, respectively. These are followed by T, which appears in approximately 5.78% of all 5-letter words, and R, which appears in approximately 5.68% of all 5-letter words.
After T and R, the frequency of the remaining letters drops significantly. For example, the letter N appears in approximately 4.62% of all 5-letter words, while the letter L appears in approximately 3.50% of all 5-letter words. The letters D, U, and G appear in approximately 2.95%, 2.34%, and 1.43% of all 5-letter words, respectively.
It’s worth noting that these frequencies can vary depending on the source of the words being analyzed. For example, if we were to analyze a dataset of technical or scientific terms, we might see a different frequency distribution than we would in a dataset of common, everyday words.
Nevertheless, the COCA dataset provides a useful starting point for understanding the frequency distribution of letters in 5-letter words. By looking at these numbers, we can see that certain letters, particularly E, A, I, O, and S, are much more likely to appear in 5-letter words than others. This can be useful information for word games or other activities that involve constructing or guessing words of a certain length.