What is what part of speech is will?

"Will" can be used as either a verb or a noun, depending on how it is used in a sentence.

As a verb, "will" is a modal verb that is used to indicate future tense or express a willingness or intention to do something. For example: "I will go to the store tomorrow" or "She will help me with my homework."

As a noun, "will" refers to a legal document that specifies a person's wishes regarding the distribution of their assets after they pass away. It is often used in phrases like "last will and testament" or "living will."