It's possible that:
* It's a misspelling. Perhaps you meant a similar word like "holder" or "hodder"?
* It's a technical term. It might be specific to a particular industry or field of study. If you can provide more context about where you encountered this word, it may be possible to determine its meaning.
* It's a made-up word. It's possible the word is a creative invention, perhaps in a fictional story or game.
Please provide more information so I can help you figure out what "hodnoker" means.