* Niece, daughter, sister are all related by kinship. They refer to specific familial relationships.
* Nun, woman, girl are all related by gender. They refer to different stages in a woman's life.
Here's a breakdown:
* Niece: Female relative of someone whose parent is a sibling of that person's parent (e.g., a sister's daughter)
* Daughter: Female child of someone
* Sister: Female sibling of someone
* Nun: A woman who has dedicated her life to religious service and has taken vows of poverty, chastity, and obedience.
* Woman: An adult female human being.
* Girl: A young female human being.