self-defense vs protection

self-defense and protection both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-defense	Yes	No	No	No
protection	Yes	No	No	No

As nouns, protection is a hypernym of self-defense; that is, protection is a word with a broader meaning than self-defense:

self-defense (noun)	protection (noun)
the act of defending yourself	the activity of protecting someone or something
	payment extorted by gangsters on threat of violence
	kindly endorsement and guidance
	the imposition of duties or quotas on imports in order to protect domestic industry against foreign competition
	a covering that is intend to protect from damage or injury
	defense against financial failure; financial independence
	the condition of being protected