self-will vs bullheadedness

self-will and bullheadedness both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-will	Yes	No	No	No
bullheadedness	Yes	No	No	No

As nouns, self-will and bullheadedness are synonyms defined as:

self-will and bullheadedness: resolute adherence to your own ideas or desires

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

self-will (noun)	bullheadedness (noun)
resolute adherence to your own ideas or desires	resolute adherence to your own ideas or desires
the trait of resolutely controlling your own behavior