tenaciousness vs pertinacity

tenaciousness and pertinacity both are nouns.

Word	Noun	Adjective	Verb	Adverb
tenaciousness	Yes	No	No	No
pertinacity	Yes	No	No	No

As nouns, tenaciousness and pertinacity are synonyms defined as:

Other synonyms of tenaciousness include doggedness, perseverance, persistence, persistency, tenacity.

tenaciousness (noun)	pertinacity (noun)
persistent determination	persistent determination