[SethTro]

Awkward, now the third now doesn't return anything

$ awk '/^[;qjkxbmwvz]*$/ { print length(), $0 }' /usr/share/dict/words | sort -nr | head 4 xxxv 3 xxx 3 xxv 2 xx 2 xv

[Nekhrimah]

With those letters, not surprised!