oscitancy vs reflex response

oscitancy and reflex response both are nouns.

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

As nouns, reflex response is a hypernym of oscitancy; that is, reflex response 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 response: an automatic instinctive unlearned reaction to a stimulus

oscitancy (noun)	reflex response (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