book vs spine

book and spine both are nouns.

Word	Noun	Adjective	Verb	Adverb
book	Yes	No	Yes	No
spine	Yes	No	No	No

book (noun)	spine (noun)
physical objects consisting of a number of pages bound together	a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin
a number of sheets (ticket or stamps etc.) bound together on one edge	the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved
a written work or composition that has been published (printed on pages bound together)	the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
a written version of a play or other dramatic composition; used in preparing for a performance	a small sharp-pointed tip resembling a spike on a stem or leaf
a compilation of the known facts regarding something or someone	any sharply pointed projection
a major division of a long written composition
a collection of rules or prescribed standards on the basis of which decisions are made
a collection of playing cards satisfying the rules of a card game
a record in which commercial accounts are recorded

book (verb)	spine (verb)
engage for a performance
record a charge in a police register
arrange for and reserve (something for someone else) in advance
register in a hotel booker