The schwa is spelled <er> or <or> in this list. The /eə/ diphthong is spelled <air>, <are>, and <è> in the loan word première.
This is a contrast between a short vowel which is always unstressed and a diphthong. It is not in itself a problem for learners.
The density figure is 0.83%. The set makes 5 semantic contrasts giving a loading of 63%.
coarser corsair cos cares courser coursair coursers corsairs hector hectare hectors hectares premier première premiers premières
John Higgins, Shaftesbury, December 2009