Here's why:
* Verbs describe actions or states of being.
* Nouns are names of people, places, things, or ideas.
In the sentence "I will submit my homework," "submit" is the action being performed.
It's important to note that while "submit" itself is a verb, the act of submitting something can be considered a noun in certain contexts. For example, you might say "The deadline for the submittal of applications is next week." Here, "submittal" is a noun that refers to the act of submitting.