job lot vs assemblage

job lot and assemblage both are nouns.

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

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

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

job lot (noun)	assemblage (noun)
a miscellaneous collection of things sold together	the social act of assembling
	a system of components assembled together for a particular purpose
	a group of persons together in one place
	several things grouped together or considered as a whole