Is there any abstract noun start with letter x and z?

Answer 1

Here's one way to find out.
Go to https://www.onelook.com
Type ~~> x*
Press Enter and scroll through the results. You may need to re-do the search by using xa* (and then re-do, using the other vowels, if needed)

Then do the same thing with z* and/or za* (etc.).

It'll take some time to scroll through these, but it's the only way I know of to hunt for something like this.

Answer 2

There is zest and xenophobia