job lot vs collection

job lot and collection both are nouns.

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

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

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

job lot (noun)	collection (noun)
a miscellaneous collection of things sold together	the act of gathering something together
	a publication containing a variety of works
	request for a sum of money
	several things grouped together or considered as a whole