goose bump vs reflex action

goose bump and reflex action both are nouns.

Word	Noun	Adjective	Verb	Adverb
goose bump	Yes	No	No	No
reflex action	Yes	No	No	No

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

goose bump: 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

goose bump (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