The /ʌ/ vowel is spelled with <u> and <o> in worry. The /ɪə/ vowel is spelled <ear>, <eer>, or <ier>.
This is a contrast between a short vowel and a diphthong widely separated in the mouth. It does not seem to be a problem for many learners.
The density figure is 0.45%. The set makes 11 semantic contrasts for a loading of 61%.
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Credit: John Higgins