Sister

noun
1.
a female offspring having both parents in common with another offspring; female sibling.
2.
Also called half sister. a female offspring having only one parent in common with another offspring.
3.
stepsister.
4.
a female friend or protector regarded as a sister.
5.
a thing regarded as feminine and associated as if by kinship with something else:
The ships are sisters.
6.
a female fellow member, as of a church.
7.
a female member of a religious community that observes the simple vows of poverty, chastity, and obedience.
8.
British. a nurse in charge of a hospital ward; head nurse.
9.
a fellow black woman.
10.
a woman who supports, promotes, or participates in feminism.
11.
Informal. a form of address used to a woman or girl, especially jocularly or contemptuously:
Listen, sister, you’ve had enough.
adjective
12.
being or considered a sister; related by or as if by sisterhood:
sister ships.
13.
having a close relationship with another because of shared interests, problems, or the like:
We correspond with school children in our sister city.
14.
Biochemistry. being one of an identical pair.
noun
1.
a female person having the same parents as another person
2.
See half-sister, stepsister
3.
a female person who belongs to the same group, trade union, etc, as another or others
4.
(informal) a form of address to a woman or girl, used esp by Black people in the US
5.
a senior nurse
6.
(mainly RC Church) a nun or a title given to a nun
7.
a woman fellow member of a Church or religious body
8.
(modifier) belonging to the same class, fleet, etc, as another or others: a sister ship
9.
(modifier) (biology) denoting any of the cells or cell components formed by division of a parent cell or cell component: sister nuclei
sissy