employee turnover vs turnover rate

employee turnover and turnover rate both are nouns.

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

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

employee turnover and turnover rate: 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 employee turnover include turnover.

employee turnover (noun)	turnover rate (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