[Gel] is spelt as [kil] in Tatar, and the negative stem of this verb is [kilma']. "-me" part is stressed, I think it works as a verbal noun )Yes, if 'me' is stressed, it's a verbal noun. If the previous syllable is stressed, then it's the negative imperative.
Gelme - the act of coming.
Gelme - don't come.
This is in Turkish, though. I'm not sure about Tatar.