You know that the kanji 田 means rice paddy, so it should be easy to work out that this word also means rice paddy.
But… what's the んぼ on the end? It sounds like jumbo (んぼ), so let's say it's a cute ending added by Japanese rice farmers, to make their rice paddies sound bigger than they are.
This word also happens to be a common way of saying "rice paddy" in conversation compared to its formal version, which you will be learning soon.
This word has hiragana attached to the kanji, which is a good sign that the reading is kun'yomi. You learned that reading when you learned the kanji, so you should be good to go.
There are a lot of rice paddies in Asia.
This is a rice field for jasmine rice.
Please do not enter the paddy in high heels.