book vs keep

book and keep both are nouns.

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

As verbs, keep is a hyponym of book; that is, keep is a word with a more specific, narrower meaning than book:

Other hyponyms of book include hold open, keep open, save.

book (noun)	keep (noun)
physical objects consisting of a number of pages bound together	the main tower within the walls of a medieval castle or fortress
a number of sheets (ticket or stamps etc.) bound together on one edge	a cell in a jail or prison
a written work or composition that has been published (printed on pages bound together)	the financial means whereby one lives
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)	keep (verb)
engage for a performance	prevent (food) from rotting
record a charge in a police register	prevent the action or expression of
arrange for and reserve (something for someone else) in advance	stick to correctly or closely
register in a hotel booker	maintain by writing regular records
	supply with necessities and support
	hold and prevent from leaving
	retain possession of
	look after; be the keeper of; have charge of
	retain rights to
	maintain for use and service
	have as a supply
	store or keep customarily
	stop (someone or something) from doing something or being in a certain state
	allow to remain in a place or position or maintain a property or feature
	conform one's action or practice to
	behave as expected during of holidays or rites
	cause to continue in a certain state, position, or activity
	supply with room and board
	maintain in safety from injury, harm, or danger
	fail to spoil or rot
	continue a certain state, condition, or activity
	to rear