Minimal Pair List Vowels 8 and 12, /ʊ/ versus /ə/ 1 pair


   Minimal pair: Vowels 8 and 12, /ʊ/ versus /ə/ 1 pair
  Since the schwa has to be unstressed while /ʊ/ is likely to be prominent, only a single pair was found in the dictionary:
backwoods backwards

The density figure is too small to be worth calculating.