martial art vs self-protection

martial art and self-protection both are nouns.

Word	Noun	Adjective	Verb	Adverb
martial art	Yes	No	No	No
self-protection	Yes	No	No	No

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

martial art: any of several Oriental arts of weaponless self-defense; usually practiced as a sport
self-protection: the act of defending yourself

Other hypernyms of martial art include self-defence, self-defense.

martial art (noun)	self-protection (noun)
any of several Oriental arts of weaponless self-defense; usually practiced as a sport	the act of defending yourself