What part of speech is hollow?

"Hollow" can be multiple parts of speech depending on how it's used in a sentence:

* Adjective: Describing a noun, meaning empty, lacking substance, or insincere.

* Example: "The old tree trunk was hollow."

* Noun: Referring to an empty space within something.

* Example: "The bird built its nest in the hollow of the tree."

* Verb: To make something hollow or empty.

* Example: "They hollowed out the pumpkin for Halloween."

Let me know if you'd like an example sentence for a specific part of speech!