What part of speech is the word bill?

The word "bill" can be several parts of speech, depending on its context:

Noun:

* A piece of paper money: "I paid for the coffee with a five dollar bill."

* A list of items to be paid for: "The restaurant bill came to $50."

* A formal proposal: "The bill was debated in Congress."

* A bird's beak: "The robin has a long, sharp bill."

Verb:

* To send a bill to someone: "The company bills its customers monthly."

Adjective:

* Related to a bill: "The bill collector arrived at the door."

Therefore, to determine the part of speech of "bill," you need to consider its meaning in the sentence.