Homophones come in pairs because they are words that are spelled different but sound the same. If you have a homophone, there must be at least two words.
For green, the color, the only homophone there is is the spelling Greene.
This is a last name (you might recognize the name Rachel Greene from the American sitcom in the 1990s, FRIENDS). Other than that, I can’t think of any other words that sound like the color but are spelled differently.
What is a homophone? ›› Homophones list ›› 50 words that sound the
