What part of speech is the word parallel?

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

* Adjective: When describing something as being parallel, like "parallel lines".

* Noun: When referring to a parallel line or a parallel situation, like "The roads run in parallel."

* Verb: When describing the act of being parallel, like "The two lines parallel each other."

So, the specific part of speech depends on the context in which it's used.