obtuseness vs oscitancy

obtuseness and oscitancy both are nouns.

Word	Noun	Adjective	Verb	Adverb
obtuseness	Yes	No	No	No
oscitancy	Yes	No	No	No

As nouns, oscitancy is a hyponym of obtuseness; that is, oscitancy is a word with a more specific, narrower meaning than obtuseness:

Other hyponyms of obtuseness include oscitance.

obtuseness (noun)	oscitancy (noun)
the quality of lacking a sharp edge or point	an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom
the quality of being slow to understand	drowsiness and dullness manifested by yawning