job lot vs aggregation

job lot and aggregation both are nouns.

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

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

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

job lot (noun)	aggregation (noun)
a miscellaneous collection of things sold together	the act of gathering something together
	several things grouped together or considered as a whole