* Noun: When referring to physical signs or markers that indicate direction, "signposts" is a noun.
* Example: "The hikers followed the signposts to the summit."
* Verb: When used to describe something that provides clear guidance or direction, "signpost" can act as a verb.
* Example: "The author signposts the key themes of the novel in the introduction."
Therefore, the part of speech for "signposts" depends on its context.