What is a homonym for kernal?

There is no true homonym for "kernel" in the sense of a word that sounds exactly the same but has a different meaning.

However, there are words that are *near homonyms*, meaning they sound very similar but have different spellings and meanings:

* Colonel: A military officer of high rank.

* Kernel: The central part of a seed or nut.

* Curnel: This is a very uncommon word, but it means "a person who is fond of curds."

If you are looking for a word that means "the central part of a seed," then "kernel" is the only correct word.