Old Testament vs Isaac

Old Testament and Isaac both are nouns.

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

Old Testament (noun)	Isaac (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 second patriarch; son of Abraham and Sarah who was offered by Abraham as a sacrifice to God; father of Jacob and Esau