What part of speech is liar?

"Liar" can be two parts of speech, depending on how it's used:

* Noun: When referring to a person who tells lies. Example: "He's a liar, don't believe a word he says."

* Adjective: When used to describe something that is false or misleading. Example: "That was a liar story."

It's important to look at the context to determine which part of speech it is.