There is no such word as "hernivorse". It is likely a misspelling or a made-up word.

Here are some possible explanations:

* Typo for "herbivore": This is the most likely scenario. Herbivores are animals that eat plants exclusively.

* Made-up term for a specific diet: It's possible someone created this term to describe a specific type of diet or a fictional creature.

* Misunderstanding: You may have heard the word used in a specific context that you didn't fully understand.

If you could provide more context about where you encountered this word, I might be able to give a more accurate answer.