Here's how it breaks down:
* Root word: The core meaning of a word, often from an older language.
* Suffix: A word part added to the end of a word to modify its meaning.
* Prefix: A word part added to the beginning of a word to modify its meaning.
"Navis" itself can be used as the basis for other words, but it's not a component that gets added to existing words. For example:
* Navigation: The act of directing a ship. "Navis" is the core meaning here.
* Naval: Relating to ships or the navy. "Navis" is the core meaning here.
So, while "navis" is a Latin word with a clear meaning, it's not used as a building block for English words in the same way that prefixes and suffixes are.