Rabbi vs Hebrew

Rabbi and Hebrew both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rabbi	Yes	No	No	No
Hebrew	Yes	Yes	No	No

Rabbi (noun)	Hebrew (noun)
a Hebrew title of respect for a Jewish scholar or teacher	the ancient Canaanitic language of the Hebrews that has been revived as the official language of Israel
	a person belonging to the worldwide group claiming descent from Jacob (or converted to it) and connected by cultural or religious ties

Rabbi (adjective)	Hebrew (adjective)
	of or relating to the language of the Hebrews
	of or relating to or characteristic of the Hebrews