* Sun: While not a perfect rhyme, the "u" sound in "sun" is close enough to create a slant rhyme.
* Run: Similar to "sun", this word has a close enough "u" sound to be a slant rhyme.
* Won: Again, the "u" sound is close, creating a slant rhyme.
* Stun: The "u" sound in "stun" is similar to "fun" but not identical.
These are just a few examples. You can also experiment with other words that have similar sounds to "fun" but don't perfectly rhyme.