different between trusty vs trustiness

English

From Middle English trusty, tristy, tresty, equivalent to trust +? -y.

trusty (comparative trustier, superlative trustiest)

trusty (plural trusties)

A trusted person, especially a prisoner who has been granted special privileges.
- 1941, James Howell Street, In my father's house
  We usta have a rule that if a trusty shot an escaping convict, then the trusty would go free.
- 1953, Raymond Chandler, The Long Goodbye, Penguin 2010, p. 58:
  The cell block is clean and doesn't smell of disinfectant. The trusties do all the work. The supply of trusties is always ample.

From Middle English tristinesse, trustinesse, equivalent to trusty +? -ness.

trustiness (uncountable)

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