Words with "ei":
* weigh
* neigh
* reign
* vein
* sleigh
* they
* obey
* survey
* convey
* deceive
* receive
Words with other spellings that sound like "ei":
* say
* way
* day
* grey
* prey
* break (the "ea" sounds like "ei")
* great (the "ea" sounds like "ei")
* steak (the "ea" sounds like "ei")
* freight (the "ei" sounds like "ay")
* straight (the "ai" sounds like "ei")
Let me know if you'd like more examples or have any other questions!