rule book vs accumulation

rule book and accumulation both are nouns.

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

As nouns, accumulation is a hypernym of rule book; that is, accumulation 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
accumulation: several things grouped together or considered as a whole

Other hypernyms of rule book include aggregation, assemblage, collection.

rule book (noun)	accumulation (noun)
a collection of rules or prescribed standards on the basis of which decisions are made	the act of accumulating
	several things grouped together or considered as a whole
	(finance) profits that are not paid out as dividends but are added to the capital base of the corporation
	an increase by natural growth or addition