A nun is a woman who has made life long religious vows to serve her god. They stay in cloisters or monestaries. Their vows include vows of chastity and they also do a lot of charity work and teachings.
I'm not sure. But i understand in some places believe people go to purgatory after death to be cleansed of sins, but nuns no need to, straigh to heaven. I personally don't agree with that.
a woman who has dedicated her life to working for god. she lives a life a poverty and chastity.
working for god means - working for those who needs help, love and prayers
lady of the church