different between pertinacity vs immutability

English

From Middle French pertinacité, from Old French pertinace (“obstinate, stubborn”).

pertinacity (usually uncountable, plural pertinacities)

The state or characteristic of being pertinacious.
- 1846, E.A.Poe, The Black Cat
  With my aversion to this cat, however, its partiality for myself seemed to increase. It followed my footsteps with a pertinacity which it would be difficult to make the reader comprehend.
- 1851, Nathaniel Hawthorne, The House of Seven Gables, ch. 19:
  Again and again, however, and half a dozen other agains, with the inexorable pertinacity of a child intent upon some object important to itself, did he renew his efforts for admittance.

From Middle French immutabilité, from Latin immutabilitas

immutability (usually uncountable, plural immutabilities)

immutability in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
immutability in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

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