What is a homonym for the word rain?

There isn't a perfect homonym for "rain" because there isn't another word that is spelled and pronounced exactly the same but has a different meaning.

However, there are near homonyms which sound similar but have different spellings:

* Reign: To rule as a monarch.

* Rein: A strap used to control a horse.

It's important to remember that homonyms are words that sound the same but have different meanings and spellings, so while these words sound similar, they are not true homonyms of "rain."