different between prominence vs usefulness

English

From obsolete French prominence (compare proéminence), from Latin prominentia.

prominence (countable and uncountable, plural prominences)

The state of being prominent: widely known or eminent.
- “My Continental prominence is improving,” I commented dryly. ¶ Von Lindowe cut at a furze bush with his silver-mounted rattan. ¶ “Quite so,” he said as dryly, his hand at his mustache. “I may say if your intentions were known your life would not be worth a curse.”
Relative importance.
A bulge: something that bulges out or is protuberant or projects from a form.
(topography) Autonomous height; relative height or prime factor; a concept used in the categorization of hills and mountains.

useful +? -ness

usefulness (countable and uncountable, plural usefulnesses)

The quality or degree of being useful.
The usefulness of his latest reorganisation has been disputed.

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