What are some root words that start with enni?

There are no root words that start with "enni" in English. Root words are the basic building blocks of words, and they typically carry the core meaning of a word.

It's possible you're thinking of a prefix or a different part of a word.

For example, you might be thinking of:

* "enni-" as a prefix, but this is not a common prefix in English. It's possible you've encountered a specialized term or a word from a different language.

* "enni" as part of a longer word, like "ennead" (a group of nine) or "ennea" (Greek for nine).

If you can provide more context or the full word you're thinking of, I can help you identify the root word or element more accurately.