Englishfor English speakers
insulator
Noun
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An insulator is a substance that does not conduct electricity or heat. It can be used to insulate things, such as a room.
barrier
Noun
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A barrier is something that stops passage; it does not allow anything to get through it.
The barrier across the road stopped traffic from getting past it.
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A barrier is an obstacle; it is something to prevents progress.
The bug in the code was a barrier to us completing the project on time.
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A barrier is a boundary or limit.
The wall surrounding the jail was a barrier to all those who want to get out.