Synonyms of 'sister'
1 siblingDictionary, relation, relative
The two sisters look nothing like one another.
2 fellow woman, colleague, associate
Modern woman has been freed from many of the duties that befell her sisters in times past.
affiliatedDictionary, allied, associated
a sister organization
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If an organization is affiliated with another larger organization, it is officially connected with the larger organization or is a member of it.
the UN and its affiliated organisations
If one thing or group is allied to another, it is related to it because the two things have particular qualities or characteristics in common.
doctors and other allied medical professionals
Your associates are the people you are closely connected with, especially at work.
the restaurant owner's business associates
Thesaurus for sister from the Collins English Thesaurus
Your sister is a girl or woman who has the same parents as you.