According to SOWPODS (the combination of Scrabble dictionaries
used around the world) there are 13 words with the pattern -U---W.
That is, six letter words with 2nd letter U and 6th letter W. In
alphabetical order, they are:
burrow
curfew
curlew
cushaw
furrow
guffaw
outlaw
outrow
outsaw
pursew
subdew
sunbow
sundew