Esther vs Old Testament

Esther and Old Testament both are nouns.

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

Esther (noun)	Old Testament (noun)
an Old Testament book telling of a beautiful Jewess who became queen of Persia and saved her people from massacre	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) a beautiful Jewess chosen by the king of Persia to be his queen; she stopped a plot to massacre all the Jews in Persia (an event celebrated by Jews as the feast of Purim)