Old Testament vs Esau

Old Testament and Esau both are nouns.

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

Old Testament (noun)	Esau (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 eldest son of Isaac who would have inherited the covenant that God made with Abraham and that Abraham passed on to Isaac; he traded his birthright to his twin brother Jacob for a mess of pottage