oscitancy vs reflex

oscitancy and reflex both are nouns.

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

As nouns, reflex is a hypernym of oscitancy; that is, reflex is a word with a broader meaning than oscitancy:

oscitancy: an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom
reflex: an automatic instinctive unlearned reaction to a stimulus

oscitancy (noun)	reflex (noun)
an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom	an automatic instinctive unlearned reaction to a stimulus
drowsiness and dullness manifested by yawning

oscitancy (adjective)	reflex (adjective)
	without volition or conscious control