Old Testament vs Aaron

Old Testament and Aaron both are nouns.

Word	Noun	Adjective	Verb	Adverb
Old Testament	Yes	No	No	No
Aaron	Yes	No	No	No

Old Testament (noun)	Aaron (noun)
the collection of books comprising the sacred scripture of the Hebrews and recording their history as the chosen people; the first half of the Christian Bible	(Old Testament) elder brother of Moses and first high priest of the Israelites; created the golden calf
	United States professional baseball player who hit more home runs than Babe Ruth (born in 1934)