different between tininess vs tinniness

English

From tiny +? -ness.

tininess (usually uncountable, plural tininesses)

The property of being tiny; minuteness.
- 1955, Robin Jenkins, The Cone-Gatherers, Canongate 2012, p. 78:
  He himself seemed to have shrunk to the tininess of the insect he had watched at the foot of the larch […]

tinny +? -ness

tinniness (uncountable)

The qualities of tin, particularly in the sense of being a cheap, low-quality metal.
The thin, unpleasant sound of an instrument made of tin, or any tinny object used to make a sound.

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