work-abstract noun

money-material noun
homework-abstract noun
food - collective noun
fruit - collective noun

(Are the kinds of nouns explained correctly?)

Yes, those are correct.

The explanations provided for some of the nouns are not entirely accurate. Let me provide you with the correct explanations for each noun:

1. Work - "Work" can be both a concrete noun and an abstract noun. As a concrete noun, it refers to the physical or mental effort that someone puts into a task or job. As an abstract noun, it refers to the concepts of labor, employment, or the overall idea of doing work.

2. Money - You correctly identified "money" as a material noun, which refers to a substance that can be physically sensed or perceived. However, it is more commonly known as a common noun, which refers to a general category of things rather than specific individual items. So "money" is a common noun representing the general concept of currency or a medium of exchange.

3. Homework - "Homework" is a concrete noun because it refers to a specific task or assignment given to students to be completed outside of class. It is not an abstract noun, which would represent ideas or concepts.

4. Food - "Food" is a common noun because it refers to a general category of substances that are consumed by living beings for nourishment. However, it is not a collective noun, which refers to a singular noun that represents a group or collection of things. Examples of collective nouns could be "herd" or "flock." Instead, "food" is a mass noun, which represents a substance that cannot be counted or made plural in a conventional way.

5. Fruit - You correctly identified "fruit" as a collective noun. Collective nouns are singular nouns that represent a group or collection of similar things. In the case of "fruit," it is a collective noun because it represents a group of individual fruits, such as apples, oranges, or bananas.

I hope this clarifies the different types of nouns and how these specific nouns fit into those categories.