horripilation vs reflex action

horripilation and reflex action both are nouns.

Word	Noun	Adjective	Verb	Adverb
horripilation	Yes	No	No	No
reflex action	Yes	No	No	No

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

horripilation: reflex erection of hairs of the skin in response to cold or emotional stress or skin irritation
reflex action: an automatic instinctive unlearned reaction to a stimulus

horripilation (noun)	reflex action (noun)
reflex erection of hairs of the skin in response to cold or emotional stress or skin irritation	an automatic instinctive unlearned reaction to a stimulus