different between obturation vs obduration

English

From Latin obturare (“to stop up”): compare French obturation.

obturation (countable and uncountable, plural obturations)

The act of stopping up, or closing, an opening.
- Deaf by an outward obturation.
(firearms) The process of a bullet expanding under pressure to fit the bore of the firearm, or a cartridge case expanding under pressure to seal the chamber.

obturation f (plural obturations)

From Latin obduratio

obduration (countable and uncountable, plural obdurations)

(obsolete) A hardening of the heart; hardness of heart.
- 1659, Joseph Hall, Susurrium cum Deo
  thou seest me decline to a careless obduration, and to a disrespective forgetfulness of thy mercies

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