Near Rhymes (Similar Sound):
* Rufus
* Stuffy
* Bluff
* Stuff
* Huff
Eye Rhymes (Spelled Similarly):
* Chuff
* Snuff
* Muff
Creative Options:
* You could use a word that rhymes with "Hilary" (like "millinery") and then pair it with a word that rhymes with "Duff" (like "stuff").
Ultimately, the best rhyme will depend on the context of what you're trying to do.