Old Testament vs Joshua

Old Testament and Joshua both are nouns.

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

Old Testament (noun)	Joshua (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	a book in the Old Testament describing how Joshua led the Israelites into Canaan (the Promised Land) after the death of Moses
	(Old Testament) Moses' successor who led the Israelites into the Promised Land; best remembered for his destruction of Jericho