Very little, just a subtle one. It is really in how you would use the two phrases. 1) I have no friend.
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Bubblebatha)I have no friend.You might hear a); it's certainly understandable. I would take it as a kind of emphatic form. But b) is far more common.
b)I have no friends.
Is there any difference between a) and b)?
Bubblebath a)There is no bench in the Park.Not really. No.
b)There are no benches in the Park.
When I choose a), it might be used as an answer to "Is there a bench that you've painted in the park?". Is my understanding right?