pigheadedness vs bullheadedness

pigheadedness and bullheadedness both are nouns.

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

As nouns, pigheadedness and bullheadedness are synonyms defined as:

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

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

pigheadedness (noun)	bullheadedness (noun)
resolute adherence to your own ideas or desires	resolute adherence to your own ideas or desires