Matins (Night Prayer)
Lauds (Morning Prayer)
Prime (beginning of the day-suppressed by Paul VI)
Terce (Mid-morning prayer)
Sext (Mid-day prayer)
None (Mid-afternoon prayer)
Vespers (End of the day prayer)
Compline (before bed prayer)
the fear of nuns is called "monachousaphobia"
A gathering of nuns is called a nunnery. Or a convent.
This question doesn't have a clear answer without knowing what services of the church you are referring to. Titles are given based on the services performed and the domination of the church. All workers are called servants of the Lord. Some are paid a salary and others are volunteers.
Nuns
Girls who were training to be nuns would be postulants when they start, and then novices. The Catholic Orders do not allow boys to be nuns or sisters.
Monks and nuns often served the community by becoming educators and teaching school. They also worked in hospitals as nurses or aids, led prayer services at churches or homes, and even made some products to sell.
Nurses are NOT typically called "sister or sisters", and would likely be seen as a put down in the US. However, many Nuns train to be nurses. Because they are Nuns, they are called Sisters.
Mary founded an order of nuns called the Sisters of St Joseph of the Sacred Heart.
That is not true. Nuns do practice times of silence at certain times during the day and evening. And they do not talk in their rooms or have visitors, even other nuns, in their bedrooms.
Sisters of Charity
prior
Yes; they are called "Brides of Christ".