What is the most commonly used word in US of America?

It's impossible to say definitively which word is the *most* commonly used in the US, as it depends on how you define "common" and how you collect the data.

Here's why it's tricky:

* Different sources: There are various sources of data about word frequency, like Google Ngram Viewer, corpora of text, and even analyzing social media. Each source has its own limitations and biases.

* Context matters: The most frequent word depends on the type of text (news articles, books, social media, etc.). For example, "the" might be more common in books, while "like" or "lol" might be more frequent on social media.

* Changing language: Language evolves constantly, so the most frequent word today might not be the same tomorrow.

That being said, some contenders for the most common word in the US include:

* "the": This is often cited as the most frequent word in English, and likely also in US English.

* "a" or "an": These articles are also very common and used extensively.

* "of": This preposition is frequently used in various grammatical structures.

Ultimately, it's difficult to pinpoint the *absolute* most common word, as the answer depends on the context and method used to gather data.