obstinacy vs mulishness

obstinacy and mulishness both are nouns.

Word	Noun	Adjective	Verb	Adverb
obstinacy	Yes	No	No	No
mulishness	Yes	No	No	No

As nouns, obstinacy and mulishness are synonyms defined as:

obstinacy and mulishness: the trait of being difficult to handle or overcome

Other synonyms of obstinacy include obstinance, stubbornness.

obstinacy (noun)	mulishness (noun)
the trait of being difficult to handle or overcome	the trait of being difficult to handle or overcome
resolute adherence to your own ideas or desires