smorgasbord vs mishmash

smorgasbord and mishmash both are nouns.

Word	Noun	Adjective	Verb	Adverb
smorgasbord	Yes	No	No	No
mishmash	Yes	No	No	No

As nouns, mishmash is a hyponym of smorgasbord; that is, mishmash is a word with a more specific, narrower meaning than smorgasbord:

smorgasbord (noun)	mishmash (noun)
an assortment of foods starting with herring or smoked eel or salmon etc with bread and butter; then cheeses and eggs and pickled vegetables and aspics; finally hot foods; served as a buffet meal	a motley assortment of things
a collection containing a variety of sorts of things