pigheadedness vs obstinacy

pigheadedness and obstinacy both are nouns.

Word	Noun	Adjective	Verb	Adverb
pigheadedness	Yes	No	No	No
obstinacy	Yes	No	No	No

As nouns, pigheadedness and obstinacy are synonyms defined as:

pigheadedness and obstinacy: resolute adherence to your own ideas or desires

Other synonyms of pigheadedness include bullheadedness, obstinance, self-will, stubbornness.

pigheadedness (noun)	obstinacy (noun)
resolute adherence to your own ideas or desires	the trait of being difficult to handle or overcome
	resolute adherence to your own ideas or desires