different between venturesomeness vs venturousness

English

venturesome +? -ness

venturesomeness (uncountable)

The degree or quality of being venturesome.
- 1899: Joseph Conrad, Youth And Two Other Stories [1]
  Somebody must lead the way. I just showed that the thing could be done; but you men brought up to the use of steam cannot conceive the vast importance of my bit of venturesomeness to the Eastern trade of the time.

venturous +? -ness

venturousness (uncountable)

The quality or state of being venturous; mettle; one's willingness to undertake potentially hazardous endeavours.

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