Concrete and abstract nouns differ by tangibility, while collective nouns refer to groups.
Concrete nouns are physical objects that can be seen and touched, like 'house' and 'chair'. Abstract nouns, on the other hand, are things we can't perceive with our senses, like 'joy' and 'love'. Collective nouns refer to groups of people or things, such as 'team' or 'herd'.
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