different between vengefully vs vengefulness

English

vengeful +? -ly

vengefully (comparative more vengefully, superlative most vengefully)

vengeful +? -ness

vengefulness (uncountable)

The state or quality of being vengeful
- ca. 1909, Mark Twain, Letters from the Earth, Letter VI:
  To this day his reason has never recovered from that shock; a wild nightmare of vengefulness has possessed him ever since, and he has almost bankrupted his native ingenuities in inventing pains and miseries and humiliations and heartbreaks wherewith to embitter the brief lives of Adam's descendants.
The vengefulness of the king was legendary.

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