Sister
sister noun
sis·ter | ˈsi-stər
Definition of sister
1 : a female who has one or both parents in common with another
2 often capitalized
a : a member of a women’s religious order (as of nuns or deaconesses)
especially : one of a Roman Catholic congregation under simple vows
b : a girl or woman who is a member of a Christian church
3a : a girl or woman regarded as a comrade
b : a girl or woman who shares with another a common national or racial origin
especially : a black girl or woman
4 : one that is closely similar to or associated with another
sister cities
5 chiefly British : NURSE
6a : GIRL, WOMAN
b : PERSON —usually used in the phrase weak sister
7 : a member of a sorority
(Definition is taken from https://www.merriam-webster.com/dictionary/start)