book vs Joel

book and Joel both are nouns.

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

book (noun)	Joel (noun)
physical objects consisting of a number of pages bound together	an Old Testament book telling Joel's prophecies
a number of sheets (ticket or stamps etc.) bound together on one edge	a Hebrew minor prophet, the second of the twelve minor prophets
a written work or composition that has been published (printed on pages bound together)
a written version of a play or other dramatic composition; used in preparing for a performance
a compilation of the known facts regarding something or someone
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)	Joel (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