[SethTro]

For Dvorak with a little assist from unix

First row

$ awk '/^[,.pyfgcrl]$/ { print length(), $0 }' /usr/share/dict/words | sort -nr | head

3 pry / ply / fry / cry

Second row

$ awk '/^[aoeuidhtns]$/ { print length(), $0 }' /usr/share/dict/words | sort -nr | head

15 tendentiousness

14 assassinations

13 instantaneous

13 insidiousness

Third row

$ awk '/^[;qjkxbmwvz]*$/ { print length(), $0 }' /usr/share/dict/words | sort -nr | head

4 xxxv

3 xxx

3 xxv

2 xx

[rwl4]

Hmm. My Mac shows these:

[...] 15 sententiousness 15 sinuatodentated 15 soundheadedness 15 tendentiousness 15 uninitiatedness 16 antisensuousness 16 ostentatiousness 17 dissentaneousness 17 instantaneousness 18 unostentatiousness

[Nekhrimah]

Not sure about that third row, the "A" is in the second row.

[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!