pertinacity vs tenaciousness

pertinacity and tenaciousness both are nouns.

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

As nouns, pertinacity and tenaciousness are synonyms defined as:

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

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