Old Testament vs Saul

Old Testament and Saul both are nouns.

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

Old Testament (noun)	Saul (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) the first king of the Israelites who defended Israel against many enemies (especially the Philistines)
	(New Testament) a Christian missionary to the Gentiles; author of several Epistles in the New Testament; even though Paul was not present at the Last Supper he is considered an Apostle