While "nimbus" itself is a root word, it also functions as a standalone word meaning a raincloud or a halo.
Here's how the word "nimbus" has evolved:
* Latin: "nimbus" (cloud)
* English: "nimbus" (cloud, halo)
It's important to note that the word "nimbus" has a rich history and has been used in various contexts throughout time, from ancient mythology to modern science.