|You have learnt about both material and common nouns. Some nouns can be used both asmaterial and common nouns.
In the first sentence, we are talking about sand as a thing (object) and not a material.
- Bowbow plays on the sand.
- Bowbow's castle is made of sand.
Here sand is a common noun.
In the second sentence, sand is the material used to make Bowbow's castle.
Here sand is a material noun.
Remember: - A material noun becomes a common noun if there is an article before it (e.g. the sand) or if the noun is in the plural.
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Click on the links below to learn more about Nouns:-
Proper and Common Nouns
Countable and Uncountable Nouns