book vs signature

book and signature both are nouns.

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

book (noun)	signature (noun)
physical objects consisting of a number of pages bound together	a distinguishing style
a number of sheets (ticket or stamps etc.) bound together on one edge	your name written in your own handwriting
a written work or composition that has been published (printed on pages bound together)	a sheet with several pages printed on it; it folds to page size and is bound with other signatures to form a book
a written version of a play or other dramatic composition; used in preparing for a performance	the sharps or flats that follow the clef and indicate the key
a compilation of the known facts regarding something or someone	a melody used to identify a performer or a dance band or radio/tv program
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)	signature (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