Are these the same things called differently or not?

Restrictive clause:

The person who taught the ceramics class is a friend of my mother’s.

Non-restrictive clause:

Every journalist has a novel in him, which is an excellent place for it.

Defining clause:

There are now only two schools in the area that actually teach Latin.

Non-defining clause:

Doctors use the testing kit for regular screening for lung and stomach cancers, which account for 70% of cancers treated in the western world.

What is the difference between these two types of clauses (restrictive and non-restrictive, and defining and non-defining)?

  • According to Wikipedia Restrictive relative clauses are also called integrated relative clauses, defining relative clauses, or identifying relative clauses. Conversely, non-restrictive relative clauses are called supplementary, appositive, non-defining or non-identifying relative clauses. So I think it is just a difference in terminology used by different English resources. – katatahito Jul 17 '19 at 7:35
  • There's no difference. 'Defining' and 'restrictive' have the same meaning when talking of clauses. Some modern grammars don't use those terms at all, but call them more accurately 'integrated' (and 'supplementary' for the non-defining/restrictive type). – BillJ Jul 17 '19 at 7:55
  • Thank you for explaining, I got rather confused when I learnt about restrictive and non-restrictive clauses. Now everything is clear to me. – Stacy Jul 17 '19 at 7:56

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