The /ɒ/ vowel is spelled <o>, or <a> after <w> or <qu> in wad and squad. The /eə/ diphthong is spelled <air> or <are>, and <ayor> in mayoral or <er> in the place name Termi.
This contrast is between a short back vowel and a front centering diphthong. It is not a problem for any learners.
Interesting pairs include:
The density value is 1.98%. The pairs make 18 semantic contrasts, giving a high loading of 95%.
Bonn bairn cod cared con cairn cons cairns folly fairly forest fairest hod hared hostile hairstyle Lodz lairds moral mayoral odd aired oz airs pod paired shod shared squad squared Tommy Termi wad wared warrior warier was wares
John Higgins, Shaftesbury, November 2009