Kuh-gar-dee-chas
Here's a breakdown:
* Comh: Pronounced like "Kuh"
* gair: Pronounced like "gar"
* deach: Pronounced like "dee-ach"
* as: Pronounced like "as"
Important note: The "gh" in "Comhgairdeachas" is silent.
It's an Irish word meaning "congratulations".