omnium-gatherum vs salmagundi

omnium-gatherum and salmagundi both are nouns.

Word	Noun	Adjective	Verb	Adverb
omnium-gatherum	Yes	No	No	No
salmagundi	Yes	No	No	No

As nouns, salmagundi is a hypernym of omnium-gatherum; that is, salmagundi is a word with a broader meaning than omnium-gatherum:

Other hypernyms of omnium-gatherum include assortment, miscellanea, miscellany, mixed bag, mixture, motley, potpourri, smorgasbord, variety.

omnium-gatherum (noun)	salmagundi (noun)
a motley assortment of things	cooked meats and eggs and vegetables usually arranged in rows around the plate and dressed with a salad dressing
	a collection containing a variety of sorts of things