* eight
* eighteen
* eighth
* neigh (the sound a horse makes)
* neighbor
* weigh
* weight
* height
* freight
* sleigh
* foreign
* reign
* rein (the strap on a bridle)
* feign
* seignior (an archaic word for lord)
There are also some less common words like "eightieth," "eighteenths," and "neighborly."
Let me know if you'd like to explore more words with "eigh" or have other word-related questions!