Bahuvrihi is a fancy word that means "much rice." It's a special kind of word that describes something by pointing to another word that describes it. So, if someone says "much rice," you would know that they're probably talking about a person who has a lot of rice.
Let's say there's a person called "Big Eater" who eats a lot of rice every day. We can describe Big Eater as a bahuvrihi because we're pointing to the words "much" and "rice" to describe this person. This kind of word is often used to describe people or things that have a lot of a certain quality.
So, to summarize, bahuvrihi is a word that describes something by pointing to another word. It's used to describe people or things that have a lot of a certain quality. And in this case, it means "much rice."