What part of speech is frank?

"Frank" can be several parts of speech depending on its use in a sentence:

* Proper noun: If "Frank" refers to a person's name, it's a proper noun.

* Example: "Frank went to the store."

* Adjective: "Frank" can mean "honest" or "straightforward" and act as an adjective.

* Example: "He gave me a frank opinion."

* Verb: "Frank" can be a verb meaning "to admit openly." This is an archaic usage and not common in modern English.

Without context, it's impossible to know for sure which part of speech "frank" is.