Near Rhymes (similar vowel sounds):
* O's:
* Focus
* Mo's
* Coves
* Groves
* I's:
* Iris
* Crisis
* Prisms
Eye Rhymes (look the same but sound different):
* Go-with
* Know-this
Less Perfect Rhymes (less similar sounds but work in certain contexts):
* Any word ending in -is, -os, -us:
* Chorus
* Nervous
* Genius
* Chaos
* Focus
It really depends on the context of what you're trying to rhyme! Let me know if you have more information about what you're working on, and I might be able to give you more specific suggestions.