horripilate vs horripilation

horripilate is not a noun while horripilation is a noun.

Word	Noun	Adjective	Verb	Adverb
horripilate	No	No	Yes	No
horripilation	Yes	No	No	No

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

horripilate (verb)	horripilation (verb)
cause (someone's) hair to stand on end and to have goosebumps
have one's hair stand on end and get goosebumps