Nurses is a plural noun for a word "NURSE."
Nurse- 1. A person trained to care for the sick or infirm, especially in a hospital.
2. A worker bee, ant, or other social insects, caring for a young brood.
3. Give medical and other attention to (a sick person).
4. Feed (a baby) at the breast.
5. Hold closely and carefully or caressingly.
6. Try to play strokes which keep (the balls) close together.
Nurses are given training in this hospital.