What part of speech is the word warming?

The word "warming" can be either a verb or an adjective, depending on how it is used in a sentence.

Here are some examples:

Verb: "The sun is warming the earth." (present participle of the verb "to warm")

Adjective: "The fireplace provides a warming glow." (describes the glow)

Let me know if you have a specific sentence in mind, and I can help you determine the part of speech!