What part of speech is the word firm?

The word "firm" can be a few different parts of speech, depending on how it's used:

* Adjective: Describing something that is strong, solid, or unyielding.

* Example: "She has a firm grip on the steering wheel."

* Noun: A company or business.

* Example: "She works for a large law firm."

* Verb: To make something stronger or more solid.

* Example: "He firmed up the soil around the plant."

So, to know the exact part of speech, you need to look at the context in which it's used.