Brain drain and Turnover

Brain drain noun - Depletion or loss of intellectual and technical personnel.

Turnover and brain drain are semantically related. in loss of important personnel topic. In some cases you can use "Turnover" instead a noun phrase "Brain drain".

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.

Brain drain and turnover are semantically related. Sometimes you can replace phrase "Brain drain" with "Turnover", this terms are similar.