Anything that holds warp under tension is a loom.
Here's a fun thing for your kids to do while you're weaving or on cold, rainy days when everyone is stuck inside. The only comments I have for this video is that you should use an odd number of warps. That way no warp threads get missed and the over/under process is not interrupted. Although he says that weft is pronounced "woof", language doesn't always remain the same. It's ok to pronounce it like the eft in "left". Happy weaving!!!