justifier vs advocate

justifier and advocate both are nouns.

Word	Noun	Adjective	Verb	Adverb
justifier	Yes	No	No	No
advocate	Yes	No	Yes	No

As nouns, advocate is a hypernym of justifier; that is, advocate is a word with a broader meaning than justifier:

justifier: a person who argues to defend or justify some policy or institution
advocate: a person who pleads for a cause or propounds an idea

Other hypernyms of justifier include advocator, exponent, proponent.

justifier (noun)	advocate (noun)
a person who argues to defend or justify some policy or institution	a person who pleads for a cause or propounds an idea
	a lawyer who pleads cases in court

justifier (verb)	advocate (verb)
	push for something
	speak, plead, or argue in favor of