Perfect Rhymes (same vowel sound and ending):
* look (very common)
* crook (less common, but still works)
Near Rhymes (similar vowel sounds but different endings):
* brook (a small stream)
* cook
* hook
* shook
* took
* sook (a type of sheep)
Eye Rhymes (spelled similarly but pronounced differently):
* rook (a bird)
* pook (archaic word for "ghost")
The best choice depends on the context and what kind of effect you're going for.