The most common one is "eigh" itself, which is simply the spelling of the number "eight".
While less common, there are some other words that include the "-eigh" sequence within them, such as:
* "sleight" (meaning skill or dexterity, often used in "sleight of hand")
* "weight" (referring to heaviness)
* "freight" (referring to goods being transported)
Let me know if you're looking for words with similar endings!