turnover rate vs employee turnover

turnover rate and employee turnover both are nouns.

Word	Noun	Adjective	Verb	Adverb
turnover rate	Yes	No	No	No
employee turnover	Yes	No	No	No

As nouns, turnover rate and employee turnover are synonyms defined as:

turnover rate and employee turnover: the ratio of the number of workers that had to be replaced in a given time period to the average number of workers

Other synonyms of turnover rate include turnover.

turnover rate (noun)	employee turnover (noun)
the ratio of the number of workers that had to be replaced in a given time period to the average number of workers	the ratio of the number of workers that had to be replaced in a given time period to the average number of workers