The /eɪ/ diphthong is spelled <aCe>, <ai>, <ay> or <ei> in eight, and occurs in the letter names A, H and K. The /aʊ/ diphthong is spelled <ou> or <ow>, and <au> in the loan word Frau.
This is a contrast between two diphthongs with different starting positions and direction of movement. It is not a problem for any learners.
Interesting pairs include:
The density figure is 8.76%. The set makes 96 semantic contrasts giving a loading of 53%.
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John Higgins, Shaftesbury, December 2009