job lot vs accumulation

job lot and accumulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
job lot	Yes	No	No	No
accumulation	Yes	No	No	No

As nouns, accumulation is a hypernym of job lot; that is, accumulation is a word with a broader meaning than job lot:

Other hypernyms of job lot include aggregation, assemblage, collection.

job lot (noun)	accumulation (noun)
a miscellaneous collection of things sold together	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