turnover vs upending

turnover and upending both are nouns.

Word	Noun	Adjective	Verb	Adverb
turnover	Yes	No	No	No
upending	Yes	No	No	No

As nouns, upending is a hypernym of turnover; that is, upending is a word with a broader meaning than turnover:

Other hypernyms of turnover include inversion.

turnover (noun)	upending (noun)
the act of upsetting something	turning upside down; setting on end
the volume measured in dollars
a dish made by folding a piece of pastry over a filling
the ratio of the number of workers that had to be replaced in a given time period to the average number of workers