Book of Isaiah vs Isaiah

Book of Isaiah and Isaiah both are nouns.

Word	Noun	Adjective	Verb	Adverb
Book of Isaiah	Yes	No	No	No
Isaiah	Yes	No	No	No

As nouns, Book of Isaiah and Isaiah are synonyms defined as:

Book of Isaiah and Isaiah: an Old Testament book consisting of Isaiah's prophecies

Book of Isaiah (noun)	Isaiah (noun)
an Old Testament book consisting of Isaiah's prophecies	an Old Testament book consisting of Isaiah's prophecies
	(Old Testament) the first of the major Hebrew prophets (8th century BC)