The term 'Nun, to another Nun' can be summed up as 'SISTER', which is a 6 letter word. A nun is a woman who has taken the vows of poverty, chastity, and obedience in a religious order. Nuns are typically associated with the Catholic Church, although there are other religious orders that have nuns as well. Nuns dedicate their lives to serving God and helping others, and they often live in communities of other nuns. The term 'SISTER' is used to refer to another nun, as a sign of respect and camaraderie.