What part of speech is the word series?

The word "series" can be two different parts of speech, depending on how it's used:

* Noun: When it refers to a set of things that are connected in some way, like "a series of events," or "a TV series."

* Adjective: When it describes something as consisting of a sequence or set, like "a series connection" (in electrical circuits).

Let me know if you have a specific sentence in mind, and I can tell you which part of speech it is in that context.