[mturmon]

OK, on my (longer at 235886 words) /usr/share/dict/words, I find that:

  sequential encoding: 21882 words overflow 2**64 (9.3%)
  frequency encoding: 2945 words overflow 2**64 (1.2%)

Some other trivia:

  mean #bits for those words over 64 bits: 
         seq = 72.0; freq = 69.3
  largest #bits: 
         seq = 115.4; freq = 101.0
  word w/ largest #bits: 
         seq = thyroparathyroidectomize [1]
         freq = pathologicopsychological [n/a]

[1] https://www.merriam-webster.com/medical/thyroparathyroidecto...