night shift

Noun night shift has 2 senses

• night shift(n = noun.time) graveyard shift - the work shift during the night (as midnight to 8 a.m.);
is a kind of duty period, shift, work shift

• night shift(n = noun.group) graveyard shift - workers who work during the night (as midnight to 8 a.m.);
is a kind of shift