What is the part of speech for fault?

"Fault" can be a few different parts of speech, depending on how it is used in a sentence:

* Noun: This is the most common usage. "The accident was caused by mechanical fault."

* Verb: "I fault him for not being honest."

* Adjective: "That's a fault line in the earth."

The best way to determine the part of speech is to look at the context of the sentence.