rabidity vs pigheadedness

rabidity and pigheadedness both are nouns.

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

As nouns, pigheadedness is a hypernym of rabidity; that is, pigheadedness is a word with a broader meaning than rabidity:

rabidity: The property of being very extreme, unreasonable, or fanatical in opinion; excessively zealous; comparable to one with rabies.
pigheadedness: resolute adherence to your own ideas or desires

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

rabidity (noun)	pigheadedness (noun)
unrestrained excitement or enthusiasm	resolute adherence to your own ideas or desires
The property of being very extreme, unreasonable, or fanatical in opinion; excessively zealous; comparable to one with rabies.