What is an exclamatory word that not related to the other words in a sentence?

You're asking for an exclamatory word that stands alone and doesn't connect grammatically to the rest of the sentence. These are often called interjections.

Here are some examples:

* Wow! That was an amazing performance!

* Goodness! Did you see how high that kite flew?

* Ouch! That really hurt.

* Oh dear! I think I forgot my keys.

* Hey! Don't forget to grab a snack on your way out.

These words express a strong feeling or emotion and are often set off by an exclamation mark. They don't act as a subject or verb within the sentence, but rather add an extra layer of expression.