I forgot to buy rice.
I heard that the weight of 100 million yen is about 10kg, so I tried to imagine what it would be like to hold 100 million yen while holding a bag of 10kg rice.
My favorite breakfast consists of uncooked rice and miso soup.
The kanji and the word are exactly the same. That means they share meanings as well.
Note that this word refers to the grains of rice more than something that's a meal. If you're eating rice at a meal you'd call it ごはん. This is like when you're talking about the rice in the fields or rice grains or something like that.
Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
"Everyone, we have rice! Come (こめ) and get it!"