bullheadedness vs pigheadedness

bullheadedness and pigheadedness both are nouns.

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

As nouns, bullheadedness and pigheadedness are synonyms defined as:

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

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

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