different between mettle vs venturousness

English

1580s, originally a variant of metal, which had a figurative sense until the early 18th century.

mettle (usually uncountable, plural mettles)

A quality of endurance and courage.
Synonyms: courage, heart, spirit
- 2001, Harry J. Alexandrowicz, Testing your Mettle: Tough Problems and Real-world Solutions for Middle and High School Teachers, page xiii
  Please read on and discover the issues in education that test the mettle of those who experience this world every day.
Good temperament and character.
(obsolete) Metal; a metallic substance.

venturous +? -ness

venturousness (uncountable)

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

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