❔ Winform - How can I make something happen when clicking a word in a textbox?

How do i make something happenen when a specific word or phrase like "hello world" is clicked in a textbox. Its among other words / phrases, like "oh and hello world today", and there would be more then one word or phrase in a textbox thats clickable and makes something happen.

I want to make words or phrases that when clicked, open a definition explaining them in more detail, but a few minutes of google before bed implied this would be a shitshow to google and i should just post a question before i go to bed.

I was gonna use rich text boxes, but I get the feeling i should use something else, or maybe it will be easier then i think. Thanks whoever tries ❤️
rich text is the first thing I thought of too
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