intransigency vs bullheadedness

intransigency and bullheadedness both are nouns.

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

As nouns, bullheadedness is a hypernym of intransigency; that is, bullheadedness is a word with a broader meaning than intransigency:

intransigency: the trait of being intransigent; stubbornly refusing to compromise
bullheadedness: resolute adherence to your own ideas or desires

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

intransigency (noun)	bullheadedness (noun)
the trait of being intransigent; stubbornly refusing to compromise	resolute adherence to your own ideas or desires