Difference between Nanometer and Nanometre

What is the difference between Nanometer and Nanometre?

Nanometer as a noun is an si subunit of length equal to 10-9 metres. symbol: nm while Nanometre as a noun is an si subunit of length equal to 10-9 metres. symbol: nm

We hope you now know whether to use Nanometer or Nanometre in your sentence.