horripilation vs pilomotor reflex

horripilation and pilomotor reflex both are nouns.

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

As nouns, horripilation and pilomotor reflex are synonyms defined as:

horripilation and pilomotor reflex: reflex erection of hairs of the skin in response to cold or emotional stress or skin irritation

Other synonyms of horripilation include goose bump, goose pimple, goose skin, goosebump, gooseflesh.

horripilation (noun)	pilomotor reflex (noun)
reflex erection of hairs of the skin in response to cold or emotional stress or skin irritation	reflex erection of hairs of the skin in response to cold or emotional stress or skin irritation