rule book vs aggregation

rule book and aggregation both are nouns.

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

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

rule 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 rule book include accumulation, assemblage, collection.

rule book (noun)	aggregation (noun)
a collection of rules or prescribed standards on the basis of which decisions are made	the act of gathering something together
	several things grouped together or considered as a whole