In the United States, if an employee is working 40 hours or more per week, the employer must give him/her the benefits required for full-time workers, for example health insurance, etc. I am not sure what the laws are in the UK and elsewhere, but it is possible there isn't a word for this situation in English because the laws are different in English-speaking countries.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.