book vs aggregation

book and aggregation both are nouns.

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

As nouns, aggregation is a hypernym of book; that is, aggregation is a word with a broader meaning than book:

book: a collection of rules or prescribed standards on the basis of which decisions are made
aggregation: several things grouped together or considered as a whole

Other hypernyms of book include accumulation, assemblage, collection.

As nouns, aggregation is a hypernym of book; that is, aggregation is a word with a broader meaning than book:

Other hypernyms of book include accumulation, assemblage, collection.

book (noun)	aggregation (noun)
physical objects consisting of a number of pages bound together	the act of gathering something together
a number of sheets (ticket or stamps etc.) bound together on one edge	several things grouped together or considered as a whole
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)	aggregation (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