nicks, nix

Nicks or nicks is the plural ( more than one ) of "nick", meaning a small cut, chip, or notch--
There are a few nicks in this old bowl, but it may be worth something anyway.
We can sand the nicks out of this old table and refinish it.

Nicks or nicks may also be the third person singular ( he, she, it ) form of the verb ( action word ) "nick", meaning to make a small cut or notch--
In this movie, the bad guy nicks the handle of his gun whenever he shoots someone.
He always nicks the dishes; I think he does it to get out of washing them.

Nix or nix ( rhymes with nicks ) is slang or informal for "no", or to veto or prohibit--
The boss said nix to a long lunch hour.
If the supervisor finds out, he will nix the party.

Now that you know that, you can say--
"Mom said nix to borrowing the dishes, because they come back with nicks in them."

Note--"Nick's" is the possessive ( belonging to ) form of "Nick", a male's given name--
Is this Nick's jacket? It's been here all week.